Compilare: main.cpp: In function 'int main()': main.cpp:31:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("castel3.in" , "r" , stdin); ^ main.cpp:32:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("castel3.out" , "w" , stdout); ^ main.cpp:33:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &task , &n); ^ main.cpp:38:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &v[i][j]); ^ main.cpp:65:13: warning: 'special' may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d %d %d" , poz[special].x , poz[special].y , maxarea.x , maxarea.y); ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~