Compilare: main.cpp: In function 'void solve()': main.cpp:32:23: warning: unused variable 's' [-Wunused-variable] int maxsum=0, s; ^ main.cpp: In function 'int main()': main.cpp:11:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("peri.in", "r", stdin); ^ main.cpp:12:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("peri.out", "w", stdout); ^ main.cpp: In function 'void read()': main.cpp:21:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:24:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &map[i][j]); ^