Compilare: user.cpp: In function ‘int main()’: user.cpp:57:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s2.size();i++) ^ user.cpp:63:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==s1.size()) ^ user.cpp:70:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i+1<s2.size()&&s1[j]!=s2[i+1]) ^ user.cpp:86:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v1.size();i++) ^