Compilare: user.cpp: In function ‘void graf()’: user.cpp:89:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0 ; i < C.size() ; ++i ){ ^ user.cpp: In function ‘void back(int)’: user.cpp:151:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( p == C[c].size() ){ ^ user.cpp:164:82: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( !used[nodvcn] && comp[nodvcn] == c && (nodvcn != last || p+1 == C[c].size()) ){ ^ user.cpp: In function ‘void find_tour()’: user.cpp:174:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( left.size() == 1 && left[0] > C.size() ){ ^ user.cpp:179:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( left[left.size()-1] > C.size() ){ ^ user.cpp:189:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( left[0] > C.size() ){ ^ user.cpp:206:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( ; i < left.size() ; i += 2 ){ ^ user.cpp:213:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( i < left.size() - 1 ) ^