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#include <stdio.h> #include <string.h> #include <ctype.h> #include <math.h> int main(int argc, char * argv[]) { int n, m; scanf("%d%d", &n, &m); int mat[n][m]; for(int i = 0; i < n; i++) { for(int j = 0; j < m; j++) { scanf("%d", &mat[i][j]); } } int k; scanf("%d", &k); float sum = 0.0, kolku = 0; for(int i = 0; i < k; i++) { int a, b; scanf("%d%d", &a, &b); if(a >= 0 && a < n && b >= 0 && b < m) { sum += mat[a][b]; kolku++; } } printf("%f\n", sum / kolku); } /* 5 4 1 2 5 0 7 2 3 1 12 0 5 4 6 1 0 1 2 3 4 5 4 1 2 0 4 5 1 2 2 **/
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