Compilare: user.cpp: In function ‘int solve(int, int)’: user.cpp:60:21: warning: unused variable ‘i’ [-Wunused-variable] int xjos, yjos, i, j, cnt, lmax; ^ user.cpp:60:24: warning: unused variable ‘j’ [-Wunused-variable] int xjos, yjos, i, j, cnt, lmax; ^ user.cpp: In function ‘int main()’: user.cpp:103:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("submatrix.in", "r", stdin); ^ user.cpp:104:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("submatrix.out", "w", stdout); ^ user.cpp:107:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &k); ^ user.cpp:110:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]); ^