Compilare: user.cpp: In function ‘int main()’: user.cpp:46:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < v.size() -1 ; i ++) ^ user.cpp:47:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i + 1; j < v.size() ; j ++) ^ user.cpp:48:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(z = 0 ; z < v.size(); z ++) ^ user.cpp:56:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0 ; i < v.size(); i ++) ^ user.cpp:57:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i + 1; j < v.size() ; j ++) ^ user.cpp:58:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(z = j + 1; z <v.size() ; z++) ^ user.cpp:37:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("patrulatere.in","r",stdin); ^ user.cpp:38:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("patrulatere.out","w",stdout); ^ user.cpp:39:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:42:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf" ,&x,&y); ^