有大神知道这段代码为什么RE吗???
#include <bits/stdc++.h>
using namespace std;
int n,m,c,a[3010][3011], b[3011][3011];
int ma = -9999, maxi,maxj;
int main(){
scanf("%d",n);
scanf("%d",m);
scanf("%d",c);
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
scanf("%d",a[i][j]);
b[i][j] = b[i-1][j] + b[i][j-1] - b[i-1][j-1] + a[i][j];
}
}
for(int i=c;i<=n;i++){
for(int j=c;j<=m;j++){
}