Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:17:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Lista[nc].size();i++){ ^ user.cpp: In function ‘void sol(int, std::pair<std::pair<int, int>, int>*, int, int)’: user.cpp:31:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Lista[nc].size();i++){ ^ user.cpp:47:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1;j<Lista[nc].size();j++){ ^ user.cpp:59:13: warning: unused variable ‘cost’ [-Wunused-variable] int cost=Lista[nc][i].s; ^