Compilare: user.cpp: In function ‘int main()’: user.cpp:49:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<x.size();++j) if(x[j] != y[j]) break; ^ user.cpp:50:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j != x.size()) continue; ^ user.cpp:56:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<y.size();++j) if(x[j] != y[j]) break; ^ user.cpp:57:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j != y.size()) continue; ^ user.cpp:63:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<x.size();++j) if(x[j] != y[j]) break; ^ user.cpp:64:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j != x.size()) continue; ^ user.cpp:81:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<x.size();++j) if(x[j] != y[j]) break; ^ user.cpp:82:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j != x.size()) continue; ^ user.cpp:88:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<y.size();++j) if(x[x.size()-j-1] != y[y.size()-j-1]) break; ^ user.cpp:89:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j != y.size()) continue; ^ user.cpp:95:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<x.size();++j) if(x[x.size()-j-1] != y[y.size()-j-1]) break; ^ user.cpp:96:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j != x.size()) continue; ^