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:72:30: 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:73:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j != x.size()) continue; ^ user.cpp:99:30: 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:100:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j != x.size()) continue; ^ user.cpp:106:30: 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:107:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j != y.size()) continue; ^ user.cpp:122:30: 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:123:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j != x.size()) continue; ^