Compilare: user.cpp: In function ‘int main()’: user.cpp:25:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ^ user.cpp: In function ‘void Matrix()’: user.cpp:44:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ^ user.cpp:47:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<s.size()-i;j++) ^ user.cpp: In function ‘int Bin_Search(int)’: user.cpp:55:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x<=sol[mij]){ ^ user.cpp: In function ‘void Solve()’: user.cpp:65:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ^ user.cpp:67:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++){ ^ user.cpp:72:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sol[now]>val) q[i+j-1].push_back(make_pair(now,val)); ^ user.cpp:75:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sol[it->first]>it->second) ^ user.cpp:68:13: warning: unused variable ‘lim’ [-Wunused-variable] int lim=min(lng,i+k-1); ^