Compilare: main.cpp: In function 'int main()': main.cpp:10:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();++i) ~^~~~~~~~~ main.cpp:18:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=s.size()-1;++i) ~^~~~~~~~~~~~ main.cpp:19:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1;j<=s.size() and v[j-1]>=v[i-1] and v[j]>=v[i-1];j+=2) ~^~~~~~~~~~