Submission #879533

#	Time	Username	Problem	Language	Result	Execution time	Memory
879533		alexdd	Weighting stones (IZhO11_stones)	C++17	100 / 100	182 ms	4604 KiB

stones

#include<bits/stdc++.h>
using namespace std;
const int INF = 1e9;
int n;
pair<int,int> aint[270000];
int lazy[270000];
pair<int,int> combine(pair<int,int> x, pair<int,int> y)
{
    return {min(x.first,y.first), max(x.second,y.second)};
}
void propagate(int nod)
{
    lazy[nod*2]+=lazy[nod];
    lazy[nod*2+1]+=lazy[nod];
    aint[nod*2].first+=lazy[nod];
    aint[nod*2].second+=lazy[nod];
    aint[nod*2+1].first+=lazy[nod];
    aint[nod*2+1].second+=lazy[nod];
    lazy[nod]=0;
}
void upd(int nod, int st, int dr, int le, int ri, int newv)
{
    if(le>ri)
        return;
    if(le==st && dr==ri)
    {
        aint[nod].first += newv;
        aint[nod].second += newv;
        lazy[nod] += newv;
        return;
    }
    propagate(nod);
    int mij=(st+dr)/2;
    upd(nod*2,st,mij,le,min(mij,ri),newv);
    upd(nod*2+1,mij+1,dr,max(mij+1,le),ri,newv);
    aint[nod] = combine(aint[nod*2], aint[nod*2+1]);
}
signed main()
{
    cin>>n;
    int r,s;
    for(int i=1;i<=n;i++)
    {
        cin>>r>>s;
        if(s==1)
        {
            upd(1,1,n,1,r,-1);
        }
        else
        {
            upd(1,1,n,1,r,1);
        }
        if(aint[1].first<0 && aint[1].second>0)
        {
            cout<<"?\n";
        }
        else if(aint[1].first<0)
            cout<<">\n";
        else
            cout<<"<\n";
    }
    return 0;
}

• Subtask 1: 100 / 100