Compilare: user.cpp: In function ‘void calc(int)’: user.cpp:36:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(grps[j].size() != i)continue; ^ user.cpp:37:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int pune = 0 ; pune<=grps[j].size();++pune) ^ user.cpp: In function ‘bool ok(std::vector<int>&)’: user.cpp:55:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cont< V.size() && x == V[cont])++cont; ^ user.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cont==V.size())return 1; ^ user.cpp:70:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(auto x:P)if(cont<V.size()&&x==V[cont])++cont; ^ user.cpp:71:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cont==V.size())return 1;random_shuffle(P.begin(), P.end()); ^ user.cpp: In function ‘int main()’: user.cpp:80:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("stiva3.in", "r", stdin); ^ user.cpp:81:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("stiva3.out", "w", stdout); ^