Submission #894968

#	Time	Username	Problem	Language	Result	Execution time	Memory
894968		Andrey	Weighting stones (IZhO11_stones)	C++14	100 / 100	42 ms	7264 KiB

stones

#include<bits/stdc++.h>
using namespace std;

vector<int> sm(500001);
vector<int> big(500001);
vector<int> wow(500001);

void upd(int l, int r, int ql, int qr, int x, int a) {
    if(l == ql && r == qr) {
        sm[x]+=a;
        big[x]+=a;
        wow[x]+=a;
        return;
    }
    int m = (l+r)/2;
    if(qr <= m) {
        upd(l,m,ql,qr,x*2,a);
    }
    else if(ql > m) {
        upd(m+1,r,ql,qr,x*2+1,a);
    }
    else {
        upd(l,m,ql,m,x*2,a);
        upd(m+1,r,m+1,qr,x*2+1,a);
    }
    big[x] = max(big[x*2],big[x*2+1])+wow[x];
    sm[x] = min(sm[x*2],sm[x*2+1])+wow[x];
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int n,a,b;
    cin >> n;
    for(int i = 1; i <= n; i++) {
        cin >> a >> b;
        a = n-a+1;
        if(b == 1) {
            upd(1,n,a,n,1,1);
        }
        else {
            upd(1,n,a,n,1,-1);
        }
        if(sm[1] >= 0) {
            cout << ">\n";
        }
        else if(big[1] <= 0) {
            cout << "<\n";
        }
        else {
            cout << "?\n";
        }
    }
    return 0;
}

• Subtask 1: 100 / 100