Compilare: main.cpp: In function 'void prnt(int, int, int, int, int)': main.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nr[l + 1][c] >= st) ~~~~~~~~~~~~~^~~~~ main.cpp:26:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nr[l + 1][c] < dr) ~~~~~~~~~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:40:33: warning: unused variable 'x' [-Wunused-variable] int t, n, st, dr, i, j, a, b, x, mx = 0; ^ main.cpp:73:16: warning: unused variable 'tr' [-Wunused-variable] unsigned int tr = 0; ^~ main.cpp:38:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("summax.in", "r", stdin); ^ main.cpp:39:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("summax.out", "w", stdout); ^ main.cpp:41:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &t, &n, &st, &dr); ^ main.cpp:44:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &vmax[i][j]); ^