Compilare: user.cpp: In function ‘void Compute(int)’: user.cpp:32:17: warning: variable ‘idx’ set but not used [-Wunused-but-set-variable] int p,u,i,j,idx,maxx,M=0; ^ user.cpp: In function ‘void Solve()’: user.cpp:60:13: warning: variable ‘idx’ set but not used [-Wunused-but-set-variable] int i,j,idx,maxx; ^ user.cpp: In function ‘void Read()’: user.cpp:24:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:25:59: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i = 1; i <= N; ++i) scanf("%d %d",&v[i].x,&v[i].y); ^ user.cpp: In function ‘int main()’: user.cpp:77:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("intfm.in","r",stdin); ^ user.cpp:78:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("intfm.out","w",stdout); ^