Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:34:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<laOut[u].size(); ++i) { ^ user.cpp: In function ‘void solve()’: user.cpp:65:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t=0; t < laIn[pre[j]].size(); ++t) dp[pre[j]] = max(dp[pre[j]], 1LL*v[pre[j]] + dp[laIn[pre[j]][t]]); ^ user.cpp:74:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<laIn[i].size(); ++j) { ^