Compilare: user.cpp: In function ‘void Precalc()’: user.cpp:45:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < G[1].size() ; i ++ ) ^ user.cpp:53:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < G[x].size() ; i ++ ) ^ user.cpp: In function ‘void Solve()’: user.cpp:68:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 0 ; j < G[sol[i]].size() ; j ++ ) ^ user.cpp:65:17: warning: unused variable ‘z’ [-Wunused-variable] int i , j , z; ^ user.cpp: In function ‘void Read()’: user.cpp:25:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d" , &n , &m ); ^ user.cpp:28:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d%d" , &x , &y , &v ); ^ user.cpp: In function ‘int main()’: user.cpp:86:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( IN , "r" , stdin ); ^ user.cpp:87:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( OUT , "w" , stdout ); ^