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   | #include <iostream> 
#include <iomanip> 
#include <cstdio> 
#include <vector> 
#include <string> 
#include <deque> 
#include <algorithm> 
#include <tuple> 
using namespace std; 
 
int n, s, l; 
vector<string> RAIDArray; 
int diskBlockCount; 
char buf[100]; 
 
void input(){ 
    ios::sync_with_stdio(false); 
    cin.tie(nullptr); 
    cin>>n>>s>>l; 
    RAIDArray.resize(n); 
    for(int i=0;i<l;i++){ 
        int diskID, data; 
        int bCnt = 0; 
        string s; 
        cin>>diskID>>s; 
        RAIDArray[diskID]=s; 
        diskBlockCount = s.size() / 8; 
    } 
} 
 
int RAID(int diskID, int localBlockID){ 
    int data; 
    sscanf((char *)&RAIDArray[diskID].c_str()[localBlockID*8],"%8X",&data); 
    return data; 
} 
 
inline bool isDiskExists(int diskID){ 
    return !RAIDArray[diskID].empty(); 
} 
 
inline int getGlobalStripeID(int blockID){ 
    return blockID / s; 
} 
 
inline int getLocalStripeID(int globalStripeID){ 
    return globalStripeID / (n-1); 
} 
 
inline int getlocalStripeECCDiskID(int localStripeID){ 
    return n - 1 - localStripeID % n; 
} 
 
inline std::tuple<int, int> getLocalDiskAndBlockID(int blockID){ 
    // Return Disk ID, Local Block ID 
    int globalStripeID = getGlobalStripeID(blockID); 
    int localStripeID = getLocalStripeID(globalStripeID); 
    int localStripeECCDiskID = getlocalStripeECCDiskID(localStripeID); 
    int localStripeDiskID = (localStripeECCDiskID + 1 + globalStripeID % (n-1)) % n; 
    int localBlockID = localStripeID * s + blockID % s; 
    return std::tuple<int, int>(localStripeDiskID, localBlockID); 
} 
 
inline std::tuple<bool, int> recoverDataDirect(int blockID){ 
    int diskID, localBlockID; 
    std::tie(diskID, localBlockID) = getLocalDiskAndBlockID(blockID); 
    if(!isDiskExists(diskID)) 
        return std::tuple<bool, int>(false, -1); 
    else 
        return std::tuple<bool, int>(true, RAID(diskID, localBlockID)); 
} 
 
inline std::tuple<bool, int> recoverDataECC(int blockID){ 
    if(l < n-1) 
        return std::tuple<bool, int>(false, -1); 
    int diskID, localBlockID; 
    int data = 0; 
    std::tie(diskID, localBlockID) = getLocalDiskAndBlockID(blockID); 
    for(int curDisk = 0;curDisk<n;curDisk++){ 
        if(curDisk == diskID)continue; 
        data ^= RAID(curDisk,localBlockID); 
    } 
    return std::tuple<bool, int>(true, data); 
} 
 
inline std::tuple<bool, int> recoverDataMain(int blockID){ 
    int diskID, localBlockID; 
    std::tie(diskID, localBlockID) = getLocalDiskAndBlockID(blockID); 
    if(localBlockID >= diskBlockCount) 
        return std::tuple<bool, int> (false, -1); 
    bool flag; 
    int result; 
    std::tie(flag, result) = recoverDataDirect(blockID); 
    if(flag) 
        return std::tuple<bool, int> (flag, result); 
    std::tie(flag, result) = recoverDataECC(blockID); 
    if(flag) 
        return std::tuple<bool, int> (flag, result); 
    return std::tuple<bool, int> (false, -1); 
} 
 
void solve(){ 
    int m, blockID; 
    cin>>m; 
    while(m--){ 
        cin>>blockID; 
        bool flag; 
        int result; 
        tie(flag, result) = recoverDataMain(blockID); 
        if(!flag) 
            cout<<"-\n"; 
        else 
            cout<<setw(8)<<setfill('0')<<hex<<uppercase<<result<<"\n"; 
    } 
} 
 
int main(){ 
    input(); 
    solve(); 
}  |