Compilare: main.cpp: In function 'int main()': main.cpp:93:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("arhipelag2.in","r",stdin); ^ main.cpp:94:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("arhipelag2.out","w",stdout); ^ main.cpp:96:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d", &n, &m) ; ^ main.cpp:101:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &mat[i][j]) ; ^