分类目录归档：模拟

UVA1588 换抵挡装置 Kickdown

发表评论
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
#include<iostream>
#include<string>
#include<map>
#include<algorithm>
#include<cmath>
#include<cstring>
#include<typeinfo>
using namespace std;
int solve(string a, string b) {
    a.append(b.size(), '0');
    for (int i = 0; i < a.size()-b.size()+1; i++) {
        bool flag = true;
        for (int j = 0; j < b.size(); j++) {
            if (a[i+j] + b[j] - '0' > '3') {
                flag = false;
                break;
            }
        }
        if (flag)
            return max(a.size()-b.size(), i + b.size());
    }
    return a.size();
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    string a, b;
    while (cin >> a >> b)cout<<min(solve(a, b),solve(b,a))<<'\n';
}

UVA202 循环小数 Repeating Decimals

发表评论

模拟除法，当出现余数第二次相同时可以记为一个循环节。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
#include<iostream>
#include<string>
#include<map>
#include<cmath>
#include<cstring>
#include<typeinfo>
using namespace std;

void solve(int a, int b) {
    int OA = a;
    string strInt = to_string(a / b);
    a %= b;
    a *= 10;
    string strDec = "";
    map<int, int> dict;
    while (dict.count(a) == 0) {
        dict[a] = strDec.size();
        strDec += to_string(a / b);
        a %= b;
        a *= 10;
    }
    string strDec1 = strDec.substr(0, dict[a]);
    string strDec2 = strDec.substr(dict[a]);
    string strDec3 = "";
    if (strDec2.size() > 50) {
        strDec3 = '(' + strDec2.substr(0, 50) + "...)";
    }
    else {
        strDec3 = '(' + strDec2 + ")";
    }
    cout << OA << "/" << b << " = " << strInt << "." << strDec1 << strDec3 << '\n';
    cout << "   " << strDec2.size() << " = number of digits in repeating cycle" << '\n';
    cout << '\n';
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int a, b;
    while (cin >> a >> b)solve(a, b);
}

蓝桥杯 历届试题 小计算器

发表评论

问题描述
　　模拟程序型计算器，依次输入指令，可能包含的指令有

　　1. 数字：’NUM X’，X为一个只包含大写字母和数字的字符串，表示一个当前进制的数
　　2. 运算指令：’ADD’,’SUB’,’MUL’,’DIV’,’MOD’，分别表示加减乘，除法取商，除法取余
　　3. 进制转换指令：’CHANGE K’，将当前进制转换为K进制(2≤K≤36)
　　4. 输出指令：’EQUAL’，以当前进制输出结果
　　5. 重置指令：’CLEAR’，清除当前数字

　　指令按照以下规则给出：
　　数字，运算指令不会连续给出，进制转换指令，输出指令，重置指令有可能连续给出
　　运算指令后出现的第一个数字，表示参与运算的数字。且在该运算指令和该数字中间不会出现运算指令和输出指令
　　重置指令后出现的第一个数字，表示基础值。且在重置指令和第一个数字中间不会出现运算指令和输出指令
　　进制转换指令可能出现在任何地方

　　运算过程中中间变量均为非负整数，且小于2^63。
　　以大写的’A’~’Z’表示10~35
输入格式
　　第1行：1个n，表示指令数量
　　第2..n+1行：每行给出一条指令。指令序列一定以’CLEAR’作为开始，并且满足指令规则
输出格式
　　依次给出每一次’EQUAL’得到的结果
样例输入
7
CLEAR
NUM 1024
CHANGE 2
ADD
NUM 100000
CHANGE 8
EQUAL
样例输出
2040

可以说样例给的挺恶心。会让人想不到，这玩意要考虑还是不考虑优先级！？最后在测试下是不需要考虑优先级的。直接挨着个的算即可。还有一个点是我进制转换写错了（竟然’A’->11，生无可恋脸）一直在调这里。。。。其他没啥了。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
#include<iostream>
#include<deque>
#include<algorithm>
#include<cassert>
#include<cstdlib>
#include<string>
using namespace std;
int n;
int radix = 10;
string radixS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
deque<long long> sll;
deque<string> sop;
long long value;
inline long long getCorDecimal(char c) {
    if ('0' <= c && c <= '9')return c - '0';
    if ('A' <= c && c <= 'Z')return c - 'A' + 10;
    assert(false);
    return -1;
}
long long Radix2Decimal(string s) {
    reverse(s.begin(), s.end());
    long long cntBase = 1, result = 0;
    for (int i = 0; i<s.size(); i++) {
        result += getCorDecimal(s[i])*cntBase;
        cntBase *= radix;
    }
    return result;
}
string Decimal2Radix(long long v) {
    string s = "";
    while (v) {
        s.push_back(radixS[v%radix]);
        v /= radix;
    }
    if (s == "")s = "0";
    reverse(s.begin(), s.end());
    return s;
}
bool calculate4Back() {
    if (sop.empty())return false;
    string & comm = sop.back();
    if (comm == "ADD")value += sll.back();
    else if (comm == "SUB")value = sll.back() - value;
    else if (comm == "MUL")value *= sll.back();
    else if (comm == "DIV")value = sll.back() / value;
    else if (comm == "MOD")value = sll.back() % value;
    else assert(false);
    sop.pop_back();
    sll.pop_back();
    sll.push_back(value);
    return true;
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin >> n;
    for (int i = 1; i <= n; i++) {
        string comm, radixV;
        cin >> comm;
        if (comm == "NUM") {
            cin >> radixV;
            value = Radix2Decimal(radixV);
            if (!calculate4Back())sll.push_back(value);
            //cout<<Decimal2Radix(sll.front())<<endl;
        }
        else if (comm == "ADD" || comm == "SUB" || comm == "MUL" || comm == "DIV" || comm == "MOD") {
            sop.push_back(comm);
        }
        else if (comm == "CHANGE") {
            cin >> radix;
        }
        else if (comm == "EQUAL") {
            cout << Decimal2Radix(sll.front()) << endl;
        }
        else if (comm == "CLEAR") {
            sll.clear();
            sop.clear();
        }
    }
}

洛谷 P1022 计算器的改良

发表评论
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
using namespace std;
int ratio = 0, constant = 0;
#define IfLetter if (ch <= 'Z'&&ch >= 'A' || ch <= 'z'&&ch >= 'a')
#define IfNumber if (ch >= '0'&&ch <= '9' || ch=='+' || ch=='-')
int main() {
    char letter;
    char ch;
    int num = 0;
    bool flag = true;
    while ((ch = getchar()) != '\n') {
        IfNumber{ // number(maybe with variable)
            ungetc(ch, stdin);
            int re = scanf("%d", &num); //specially prepared for the testcase form like "-a"
            if (re == 0) {
                getchar();
                ratio -= (flag ? 1 : -1);
            }
            ch = getchar();
            IfLetter{
                ratio += num * (flag ? 1 : -1);
                letter = ch;
            }
            else {
                constant += num * (flag ? 1 : -1);
                ungetc(ch, stdin);
            }
            num = 0;
        }
        else IfLetter{ //pure variable without ratio
            letter = ch;
            ratio+=(flag ? 1 : -1);
        }
        else if (ch == '=') {
            flag = false;
        }
    }
    printf("%c=%.3lf", letter, -1.0*constant / ratio);
}

洛谷 P1058 立体图

发表评论

虽然写的时间很长，但是AC之后随便画图可是很好玩的哦。。。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
#include<iostream>
#include<string>
#include<cstring>
#include<algorithm>
#include<functional>
#define ll long long
#define pii pair<int,int>
#define PINF 0x7fffffff
#define NINF 0x80000000
using namespace std;
int m, n, am, an;
int arr[55][55];
char output[500][500];
int calM(int m, int mh, int tm) { //每行挑最大的执行一次
    return (tm - m + 1) * 2 + max(1 + 3 * mh, 1 + 2 * (m - 1));
}
inline int calN(int m, int n) { //整体执行一次
    return 1 + 4 * n + 2 * m;
}
inline void printLine(int x, int y) {
    output[x][y] = output[x][y + 4] = '+';
    output[x][y + 1] = output[x][y + 2] = output[x][y + 3] = '-';
}
inline void printRow(int x, int y) {
    output[x][y] = output[x + 2][y - 2] = '+';
    output[x + 1][y - 1] = '/';
}
inline void printHeight(int x, int y) {
    output[x][y] = output[x + 3][y] = '+';
    output[x + 1][y] = output[x + 2][y] = '|';
}
inline void printSpace(int x, int y) {
    output[x + 1][y] = output[x + 1][y + 1] = output[x + 1][y + 2] = ' ';
    output[x + 3][y - 1] = output[x + 3][y] = output[x + 3][y + 1] = ' ';
    output[x + 4][y - 1] = output[x + 4][y] = output[x + 4][y + 1] = ' ';
    output[x + 2][y + 3] = output[x + 3][y + 3] = ' ';
}
inline void printCube(int x, int y) { //左上角坐标
    printLine(x, y);
    printLine(x + 2, y - 2);
    printLine(x + 5, y - 2);
    printRow(x, y);
    printRow(x, y + 4);
    printRow(x + 3, y + 4);
    printHeight(x + 2, y - 2);
    printHeight(x + 2, y + 2);
    printHeight(x, y + 4);
    printSpace(x, y);
}
inline void printCube2(int l, int r, int h) {
    printCube(am - 3 * h - 2 * (m-l+1), 1+2 * (m - l + 1) + (r - 1) * 4);
}
inline void printAns() {
    for (int i = 1; i <= am; i++) {
        cout << output[i] + 1 << endl;
    }
    cout << endl;
}
int main() {
    cin >> m >> n;
    an = calN(m, n);
    for (int i = 1; i <= m; i++) {
        int mmax = 0;
        for (int j = 1; j <= n; j++) {
            cin >> arr[i][j];
            mmax = max(mmax, arr[i][j]);
        }
        am = max(am, calM(i, mmax, m));
    }
    for (int i = 1; i <= am; i++) {
        for (int j = 1; j <= an; j++) {
            output[i][j] = '.';
        }
    }
    for (int i = 1; i <= m; i++) {
        for (int j = 1; j <= n; j++) {
            for (int k = 1; k <= arr[i][j]; k++) {
                printCube2(i, j, k);
                //printAns();
            }
        }
    }
    printAns();
}

提示：把79行的注释符号去掉可以看到图形生成全过程哦；
写了个好玩的小程序，随机生成数组中的高度哦。。。
各位OIer可以随便试试。。。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
#include<iostream>
#include<string>
#include<cstring>
#include<algorithm>
#include<functional>
#include<ctime>
#define ll long long
#define pii pair<int,int>
#define PINF 0x7fffffff
#define NINF 0x80000000
using namespace std;
int m, n, am, an;
int arr[55][55];
char output[500][500];
int calM(int m, int mh, int tm) { //每行挑最大的执行一次
    return (tm - m + 1) * 2 + max(1 + 3 * mh, 1 + 2 * (m - 1));
}
inline int calN(int m, int n) { //整体执行一次
    return 1 + 4 * n + 2 * m;
}
inline void printLine(int x, int y) {
    output[x][y] = output[x][y + 4] = '+';
    output[x][y + 1] = output[x][y + 2] = output[x][y + 3] = '-';
}
inline void printRow(int x, int y) {
    output[x][y] = output[x + 2][y - 2] = '+';
    output[x + 1][y - 1] = '/';
}
inline void printHeight(int x, int y) {
    output[x][y] = output[x + 3][y] = '+';
    output[x + 1][y] = output[x + 2][y] = '|';
}
inline void printSpace(int x, int y) {
    output[x + 1][y] = output[x + 1][y + 1] = output[x + 1][y + 2] = ' ';
    output[x + 3][y - 1] = output[x + 3][y] = output[x + 3][y + 1] = ' ';
    output[x + 4][y - 1] = output[x + 4][y] = output[x + 4][y + 1] = ' ';
    output[x + 2][y + 3] = output[x + 3][y + 3] = ' ';
}
inline void printCube(int x, int y) { //左上角坐标
    printLine(x, y);
    printLine(x + 2, y - 2);
    printLine(x + 5, y - 2);
    printRow(x, y);
    printRow(x, y + 4);
    printRow(x + 3, y + 4);
    printHeight(x + 2, y - 2);
    printHeight(x + 2, y + 2);
    printHeight(x, y + 4);
    printSpace(x, y);
}
inline void printCube2(int l, int r, int h) {
    printCube(am - 3 * h - 2 * (m - l + 1), 1 + 2 * (m - l + 1) + (r - 1) * 4);
}
inline void printArray() {
    cout << "Printing each element of the array:" << endl;
    for (int i = 1; i <= m; i++) {
        for (int j = 1; j <= m; j++) {
            cout << arr[i][j] << " ";
        }
        cout << endl;
    }
}
inline void printAns() {
    for (int i = 1; i <= am; i++) {
        cout << output[i] + 1 << endl;
    }
    cout << endl;
}
int main() {
    srand((unsigned)time(NULL));
    cout << "Please input the side length "n" of the cube array (n<=50):";
    int len;
    cin >> len;
    m = n = len;
    an = calN(m, n);
    cout << "Please input the max height "mh" of cubes in each array item (1<=mh<=100):";
    int mh;
    cin >> mh;
    cout << "Do you want to show the whole process of filling?(Answer with 0[No] or 1[Yes]):";
    bool flag;
    cin >> flag;
    for (int i = 1; i <= m; i++) {
        int mmax = 0;
        for (int j = 1; j <= n; j++) {
            arr[i][j] = rand() % mh + 1;
            mmax = max(mmax, arr[i][j]);
        }
        am = max(am, calM(i, mmax, m));
    }
    for (int i = 1; i <= am; i++) {
        for (int j = 1; j <= an; j++) {
            output[i][j] = '.';
        }
    }
    cout << "Automatically generated an array,printed in the following.Press ENTER to continue." << endl;
    printArray();
    cin.get(); cin.get();
    for (int i = 1; i <= m; i++) {
        for (int j = 1; j <= n; j++) {
            for (int k = 1; k <= arr[i][j]; k++) {
                if (flag)cout << "Printing cube on postion(" << i << "," << j << "," << k << ")." << endl;
                printCube2(i, j, k);
                if (flag)printAns();
            }
        }
    }
    cout << "Printing Final Result:" << endl;
    printAns();
}

洛谷 谁拿了最多奖学金

发表评论

这题本身没啥好说的，非常简单，要说的是C++的一个特性。
这个题写的比较复杂，其实不用这么多空间，也不要排序，直接线性处理就行了。但是我写题写习惯了，又接着搞排序，就出了这么个问题。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
#include<bits/stdc++.h>
using namespace std;
int n;
struct stu{
    string name;
    int fs,cs;
    char sl,wp;
    int an;
    int money;
    stu(){
        money=0;
    }
    bool operator < (const stu& s2){
        return money>=s2.money;
    }
}stus[105];
int sum=0;
int main(){
    cin>>n;
    for(int i=1;i<=n;i++)
        cin>>stus[i].name>>stus[i].fs>>stus[i].cs>>stus[i].sl>>stus[i].wp>>stus[i].an;
    for(int i=1;i<=n;i++){
        if(stus[i].fs>80&&stus[i].an>=1)stus[i].money+=8000;
        if(stus[i].fs>85&&stus[i].cs>80)stus[i].money+=4000;
        if(stus[i].fs>90)stus[i].money+=2000;
        if(stus[i].fs>85&&stus[i].wp=='Y')stus[i].money+=1000;
        if(stus[i].cs>80&&stus[i].sl=='Y')stus[i].money+=850;
        sum+=stus[i].money;
    }
    sort(stus+1,stus+n+1);
    cout<<stus[1].name<<endl;
    cout<<stus[1].money<<endl;
    cout<<sum;
}

问题就出在比较的>=号上。查找了资料（地址http://blog.sina.com.cn/s/blog_532f6e8f01014c7y.html），我没细看，总结出来就是sort的cmp不能用带=号的。这个问题我最后就用stable_sort解决了。好用。代码如下：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
#include<iostream>
#include<algorithm>
using namespace std;
int n;
struct stu{
    string name;
    int fs,cs;
    char sl,wp;
    int an;
    int money;
    bool operator < (const stu& s2) const{
        return money>s2.money;
    }
}stus[205];
int sum1=0;
int main(){
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>stus[i].name>>stus[i].fs>>stus[i].cs>>stus[i].sl>>stus[i].wp>>stus[i].an;
    }
    for(int i=1;i<=n;i++){
        if(stus[i].fs>80&&stus[i].an>=1)stus[i].money+=8000;
        if(stus[i].fs>85&&stus[i].cs>80)stus[i].money+=4000;
        if(stus[i].fs>90)stus[i].money+=2000;
        if(stus[i].fs>85&&stus[i].wp=='Y')stus[i].money+=1000;
        if(stus[i].cs>80&&stus[i].sl=='Y')stus[i].money+=850;
        sum1+=stus[i].money;
    }
    stable_sort(stus+1,stus+n+1);
    cout<<stus[1].name<<endl;
    cout<<stus[1].money<<endl;
    cout<<sum1;
}

NOIP2017普及组前两道水题

发表评论

T1

1
2
3
4
5
6
7
8
#include<iostream>
using namespace std;
int main() {
    double a, b, c;
    cin >> a >> b >> c;
    long long re = 0.2*a + 0.3*b + 0.5*c;
    cout << re;
}

T2

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
using namespace std;
bool cmp(string s1, string s2) {
    if (s1.length() != s2.length())return s1.length() < s2.length();
    return s1 < s2;
}
int main() {
    int n, q;
    vector<string> arr;
    cin >> n >> q;
    for (int i = 1; i <= n; i++) {
        string tmp;
        cin >> tmp;
        arr.push_back(tmp);
    }
    sort(arr.begin(), arr.end(), cmp);
    for (int i = 1; i <= q; i++) {
        int tmpi;
        string tmp;
        cin >> tmpi >> tmp;
        bool flag = false;
        for (vector<string>::iterator ptr = arr.begin(); ptr != arr.end(); ptr++) {
            if (ptr->length() - tmp.length() <=1e9 && ptr->substr(ptr->length() - tmp.length()) == tmp) {
                flag = true;
                cout << (*ptr) << endl;
                break;
            }
        }
        if (!flag)cout << "-1" << endl;
    }
}

洛谷 机器翻译

发表评论

题号：1540

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
#include<bits/stdc++.h>
using namespace std;
int m, n;
int head = 0, tail = 0;
int arr[105];
int cnt;
int main(){
    ios::sync_with_stdio(false);
    cin >> m >> n;
    m++;
    for (int i = 0; i < m; i++){
        arr[i] = -1;
    }
    for (int i = 1; i <= n; i++){
        int word;
        cin >> word;
        bool flag = false;
        for (int i = head; i != tail; i = (i + 1) % m){
            if (arr[i] == word){
                flag = true;
                break;
            }
        }
        if (!flag){
            if (head == (tail + 1) % m)head = (head + 1) % m;
            cnt++;
            arr[tail] = word;
            tail = (tail + 1) % m;
        }
    }
    cout << cnt;
}

洛谷 序言页码 Preface Numbering

发表评论

也是一道恶心的题，相比上面那一道一点不会2333.
题号：1465

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
char str[31][5] = {
    " ", "I", "II", "III", "IV", "V", "VI", "VII", "VIII",
    "IX", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX",
    "XC", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC",
    "CM", "M", "MM", "MMM"
};
char arr1[8] = "IVXLCDM";
int num[31] = {
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 200,
    300, 400, 500, 600, 700, 800, 900, 1000, 2000, 3000
};
int a[26];
void _find(int x){
    int j = 30;
    while (num[j] > x)j--;
    for (; j >= 1; j--){
        if (x >= num[j]){
            x -= num[j];
            for (int i = 0; i < strlen(str[j]); i++){
                a[str[j][i] - 'A']++;
            }
        }
        if (x == 0)return;
    }
}
int main(){
    int n;
    scanf("%d", &n);
    for (int i = 1; i <= n; i++){
        _find(i);
    }
    if (a[int('I') - 65] != 0) printf("I %d\n", a[int('I') - 65]);
    if (a[int('V') - 65] != 0) printf("V %d\n", a[int('V') - 65]);
    if (a[int('X') - 65] != 0) printf("X %d\n", a[int('X') - 65]);
    if (a[int('L') - 65] != 0) printf("L %d\n", a[int('L') - 65]);
    if (a[int('C') - 65] != 0) printf("C %d\n", a[int('C') - 65]);
    if (a[int('D') - 65] != 0) printf("D %d\n", a[int('D') - 65]);
    if (a[int('M') - 65] != 0) printf("M %d\n", a[int('M') - 65]);
}

只有这样才能过……

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
#include<cstdlib>
#include<cstring>
#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
using namespace std;
char str[31][5] = {
    " ", "I", "II", "III", "IV", "V", "VI", "VII", "VIII",
    "IX", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX",
    "XC", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC",
    "CM", "M", "MM", "MMM"
};
char arr[8] = "IVXLCDM";
int num[31] = {
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 200,
    300, 400, 500, 600, 700, 800, 900, 1000, 2000, 3000
};
int a[26];
void _find(int x){
    int j = 30;
    while (num[j] > x)j--;
    for (; j >= 1; j--){
        if (x >= num[j]){
            x -= num[j];
            for (int i = 0; i < strlen(str[j]); i++){
                a[str[j][i] - 'A']++;
            }
        }
        if (x == 0)return;
    }
}
int main(){
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++){
        _find(i);
    }
    for (int i = 0; i < 8; i++){
        if (a[arr[i] - 'A'] != 0)cout << (char)(arr[i]) << " " << a[arr[i] - 'A'] << endl;
    }
}

这样莫名其妙多出来一行输出@_500，根本不知道怎么回事……