Submission #336946

#	Time	Username	Problem	Language	Result	Execution time	Memory
336946		BY_KUTBILIM	Weighting stones (IZhO11_stones)	C++14	100 / 100	288 ms	4588 KiB

stones

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

#define ff first
#define ss second
#define pb push_back
#define ll long long

const int N = (int)1e6 + 12;

int mx[N], mn[N], add[N];

void push(int v, int l, int r){
    if(add[v] != 0){
        if(l != r){
            add[v*2] += add[v];
            add[v*2+1] += add[v];
        }
        mx[v] += add[v];
        mn[v] += add[v];
        add[v] = 0;
    }
}

void update(int v, int tl, int tr, int l, int r, int val){
    push(v, tl, tr);
    if(tr < l || tl > r)return ;
    if(l <= tl and tr <= r){
        add[v] += val;
        push(v, tl, tr);
        return ;
    }
    int tm = (tl + tr) / 2;
    update(v*2, tl, tm, l, r, val);
    update(v*2+1, tm+1, tr, l, r, val);
    mx[v] = max(mx[v*2], mx[v*2+1]);
    mn[v] = min(mn[v*2], mn[v*2+1]);
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie();

    int n;
    cin >> n;
    int t = n;
    while(t--){
        int r, s;
        cin >> r >> s;
        if(s == 1){
            update(1, 1, n, 1, r, 1);
        } else{
            update(1, 1, n, 1, r, -1);
        }
        if(mx[1] >= 0 and mn[1] >= 0){
            cout << ">\n";
        } else if(mx[1] <= 0 and mn[1] <= 0){
            cout << "<\n";
        } else cout << "?\n";
    }

    return 0;
}

• Subtask 1: 100 / 100