Compilare: user.cpp: In function ‘int verif(int)’: user.cpp:31:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (l>v[1].size())return 0; ^ user.cpp:36:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i < v[k].size(); i++) ^ user.cpp:37:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i+l-1 < v[k].size()) w[k].push_back( number(v[k], i, i+l-1) ); ^ user.cpp:41:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i < w[1].size(); i++) sol.push_back(w[1][i]); ^