Compilare: user.cpp: In function ‘int get_answer(std::vector<std::pair<int, int> >)’: user.cpp:21:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<A.size();++i) ^ user.cpp:26:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=A.size();++i) dp[i]=1<<30; ^ user.cpp:31:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<bal[i][0].size();++j) P=max(P,bal[i][0][j]); ^ user.cpp:33:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<bal[i][1].size();++j) P_=max(P_,bal[i][1][j]); ^