Compilare: user.cpp: In function ‘int main()’: user.cpp:44:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v1[i].size();j++){ ^ user.cpp:45:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<v2[i].size()/*dist>abs(v1[i][j].first-v2[i][k].first)*/;k++){ ^ user.cpp:57:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();i++) ^