Compilare: main.cpp: In function 'int main()': main.cpp:15:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.size();i++) ~^~~~~~~~~ main.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b.size();i++) ~^~~~~~~~~ main.cpp:30:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] (i+ps[i]+1<b.size()&&i-ps[i]-1>=0)&& ~~~~~~~~~^~~~~~~~~