제출 #871986

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
871986		vjudge1	Deda (COCI17_deda)	C++17	100 / 140	115 ms	2276 KiB

deda

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

const int N = 200'000 + 7, SQ = 450;
int n, q, a[N], mn[SQ];

void read_input() {
    cin >> n >> q;
}

void change(int x, int y) {
    a[y] = x;
    mn[y / SQ] = min(mn[y / SQ], x);
}

int get(int y, int b) {
    for (int i = b; i / SQ <= b / SQ; i++)
        if (a[i] <= y)
            return i;
    for (int i = b / SQ + 1; i <= n / SQ; i++)
        if (mn[i] <= y)
            for (int j = i * SQ; j < (i + 1) * SQ; j++)
                if (a[j] <= y)
                    return j;
    return -1;
}

void pre_process() {
    fill(a, a + N, 1e9 + 1);
    fill(mn, mn + SQ, 1e9 + 1);
}

void solve() {
    while (q--) {
        char c;
        int x, y;
        cin >> c >> x >> y;
        if (c == 'M')
            change(x, y - 1);
        else {
            int t = get(x, y - 1);
            cout << (t == -1 ? -1 : t + 1) << '\n';
        }
    }
}

int main() {
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    read_input();
    pre_process();
    solve();
}

• Subtask 1: 100 / 140