Compilare: user.cpp: In function ‘int main()’: user.cpp:26:28: warning: argument to ‘sizeof’ in ‘void* memset(void*, int, size_t)’ call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memset( ct , 0 , sizeof(ct) ); ^ user.cpp:33:17: warning: narrowing conversion of ‘y’ from ‘int’ to ‘short int’ inside { } [-Wnarrowing] ct[pos] = { y , c , adj[x] }; ^ user.cpp:36:17: warning: narrowing conversion of ‘x’ from ‘int’ to ‘short int’ inside { } [-Wnarrowing] ct[pos] = { x , 0 , adj[y] }; ^ user.cpp:18:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.in" , "r" , stdin); ^ user.cpp:19:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:31:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&x,&y,&c); ^ user.cpp:106:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.out" , "w" , stdout); ^