救命！bebug一小时没看出哪里错了！加急

#include<bits/stdc++.h>
using namespace std;
int student[10005][10005];

struct song{
    int h,id;
}songs[105];

bool cmp(song x,song y){
    return x.h>y.h;
}

int main()
{
    int n,m,a,b;
    cin>>n>>m>>a>>b;
    int maxn=-9999,maxid=-85;
    for(int i=1;i<=a;i++){
        for(int j=1;j<=n;j++){
            cin>>student[i][j];
            if(i==b){
                if(student[i][j]>maxn){
                    maxn=student[i][j];
                    maxid=j;
                }
            }
        }
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=a;j++){
            songs[i].h+=student[j][i];
        }
        songs[i].id=i;
    }
    sort(songs+1,songs+n+1,cmp);
    vector<int> songs2;
    bool flag=false;
    songs2.push_back(-11);
    for(int i=1;i<=m;i++){
        songs2.push_back(songs[i].id);
        if(maxid==songs2[i]){
            flag=true;
            songs2.pop_back();
            songs2.insert(songs2.begin(),maxid);
        }
    }
    if(flag==false){
        songs2.pop_back();
        songs2.push_back(maxid);
    }
    for(int i=1;i<=m;i++)
        cout<<songs2[i]<<" ";
    return 0;
}
/*
4 3 3 2
2 4 3 1
1 2 3 4
2 3 4 1
*/