func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 1e3 + 10;   long long c[2][2][maxn][maxn];   int lowbit(int s) { return s & (-s); }   void modify(int x, int y, int v) {     for (int i = x; i < maxn; i += lowbit(i))       for (int j = y; j < maxn; j += lowbit(j)) c[x & 1][y & 1][i][j] ^= v;     return;   }   long long query(int x, int y) {     long long ret = 0;     for (int i = x; i > 0; i -= lowbit(i))       for (int j = y; j > 0; j -= lowbit(j)) ret ^= c[x & 1][y & 1][i][j];     return ret;   }   int main(void) {     int n, m;     scanf( %d %d , &n, &m);     while (m--) {       long long v;       int op, x0, y0, x1, y1;       scanf( %d %d %d %d %d , &op, &x0, &y0, &x1, &y1);       if (op == 2) {         scanf( %I64d , &v);         modify(x0, y0, v);         modify(x0, y1 + 1, v);         modify(x1 + 1, y0, v);         modify(x1 + 1, y1 + 1, v);       } else         printf( %I64d n , query(x1, y1) ^ query(x0 - 1, y1) ^ query(x1, y0 - 1) ^                               query(x0 - 1, y0 - 1));     }     return 0;   }   