Compilare: main.cpp: In function 'int main()': main.cpp:4:327: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] using namespace std;ifstream f("ttg.in");ofstream g("ttg.out");vector<pair<int,int>> t;map<int,int,greater<int>>c;int main(){int m,i,n,z,x,l;map<int,int>::iterator p,q;f>>m>>n;for(i=0;i<m;i++){f>>z;l=-1;while(z--){f>>x;if(l>x)t.push_back({l,x});l=x;}}sort(t.begin(),t.end(),greater<pair<int,int>>());c[t[0].s]=t[0].f;for(i=1;i<t.size();i++){p=c.lower_bound(t[i].f);q=c.lower_bound(t[i].s);if(q==c.end())c[t[i].s]=max(p->s,t[i].f);}while(n--){f>>x;g<<max(x,c.lower_bound(x)->s)<<'\n';}} ~^~~~~~~~~