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Cod sursa(job #631422)
#include <fstream>
using namespace std;
#define NMAX 1024
char map[NMAX][NMAX], c;
int fw[NMAX][NMAX], bc[NMAX][NMAX], v[26];
int main()
{
ifstream fin("matrix.in");
ofstream fout("matrix.out");
int n, m, i, j, k;
char c;
fin >> n >> m;
printf("%d %d\n", n, m);
for (i=1; i<=n; ++i) {
for (j=1; j<=n; ++j) {
fin >> map[i][j];
map[i][j] -= 'a';
}
}
for (i=1; i<=m; ++i) {
for (j=1; j<=m; ++j) {
fin >> c;
++v[c-'a'];
}
}
for (k=0; k<26; ++k) {
for (i=1; i<=n; ++i)
for (j=1; j<=n; ++j)
fw[i][j] = fw[i-1][j] + fw[i][j-1] - fw[i-1][j-1] + (map[i][j] == k);
for (i=m; i<=n; ++i)
for (j=m; j<=n; ++j) {
int val = fw[i][j] - fw[i-m][j] - fw[i][j-m] + fw[i-m][j-m];
if (val != v[k])
bc[i][j] = 1;
}
}
int count=0;
for (i=m; i<=n; ++i)
for (j=m; j<=n; ++j)
count += (bc[i][j] == 1);
fout << (n-m+1)*(n-m+1)-count;
return 0;
}