Submission #901412

#	Time	Username	Problem	Language	Result	Execution time	Memory
901412		LOLOLO	Weighting stones (IZhO11_stones)	C++14	100 / 100	52 ms	5720 KiB

stones

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define sz(x)   (int)(x).size()
#define len(x)  (int)(x).length()
#define cntbit(x)  builtin_popcnt(x)
#define f   first
#define s   second
#define pb  push_back

const int N = 1e5 + 100;
pair <int, int> seg[N * 4];
int laz[N * 4];

void push(int id) {
    int t = laz[id];
    laz[id * 2] += t;
    laz[id * 2 + 1] += t;
    seg[id * 2].f += t, seg[id * 2].s += t, seg[id * 2 + 1].f += t, seg[id * 2 + 1].s += t;    
    laz[id] = 0;
}

void upd(int id, int l, int r, int u, int v, int add) {
    if (l > v || r < u)
        return;

    if (l >= u && r <= v) {
        laz[id] += add;
        seg[id].f += add, seg[id].s += add;
        return;
    }

    push(id);
    int m = (l + r) / 2;
    upd(id * 2, l, m, u, v, add);
    upd(id * 2 + 1, m + 1, r, u, v, add);
    seg[id].f = max(seg[id * 2].f, seg[id * 2 + 1].f);
    seg[id].s = min(seg[id * 2].s, seg[id * 2 + 1].s);
}

char check() {
    if (seg[1].s >= 0) {
        return '>';
    }

    if (seg[1].f <= 0) {
        return '<';
    }

    return '?';
}

ll solve() {
    int n;
    cin >> n;

    for (int i = 0; i < n; i++) {
        int r, s;
        cin >> r >> s;

        r = n - r + 1;
        if (s == 1) {
            upd(1, 1, n, r, n, 1);
        } else {
            upd(1, 1, n, r, n, -1);
        }

        cout << check() << '\n';
    }

    return 0;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int t = 1;
    //cin >> t;

    while (t--) {
        solve();
        //cout << solve() << '\n';
    }

}

• Subtask 1: 100 / 100