Compilare: main.cpp: In function 'int main()': main.cpp:104:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("manhattan.in","r",stdin); ^ main.cpp:105:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("manhattan.out","w",stdout); ^ main.cpp:121:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&a,&b,&c,&d); ^ main.cpp:123:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&e,&f,&g,&h); ^ main.cpp: In function 'int F(int, int, int, int, int, int)': main.cpp:101:1: warning: control reaches end of non-void function [-Wreturn-type] } ^