Submission #570716

#	Time	Username	Problem	Language	Result	Execution time	Memory
570716		saarang123	Simple game (IZhO17_game)	C++17	100 / 100	71 ms	6844 KiB

game

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

const int MXN = 100 * 1000 + 3;
const int MXM = 1000 * 1000 + 3;
int bit[MXM], a[MXN], n, q;

void upd(int x, int v = 1) {
	for(; x < MXM; x += (x & -x))
		bit[x] += v;
}

void upd(int l, int r, int v) {
	upd(l, v);
	upd(r + 1, -v);
}

int qry(int x) {
	int res = 0;
	for(; x > 0; x -= (x & -x))
		res += bit[x];
	return res;
}

signed main() {
    std::ios::sync_with_stdio(0);
    std::cin.tie(0);
    cin >> n >> q;
    for(int i = 1; i <= n; i++) {
    	cin >> a[i];
    	if(i > 1) {
    		int x = min(a[i - 1], a[i]);
    		int y = max(a[i - 1], a[i]);
    		upd(x, y, 1);
    	}
    }
    while(q--) {
    	int tp; cin >> tp;
    	if(tp == 1) {
    		int i, val;
    		cin >> i >> val;
    		if(i > 1) {
	    		int x = min(a[i - 1], a[i]);
	    		int y = max(a[i - 1], a[i]);
	    		upd(x, y, -1);
    		}
    		if(i < n) {
    			int x = min(a[i + 1], a[i]);
	    		int y = max(a[i + 1], a[i]);
	    		upd(x, y, -1);
    		}
    		a[i] = val;
    		if(i > 1) {
	    		int x = min(a[i - 1], a[i]);
	    		int y = max(a[i - 1], a[i]);
	    		upd(x, y, 1);
    		}
    		if(i < n) {
    			int x = min(a[i + 1], a[i]);
	    		int y = max(a[i + 1], a[i]);
	    		upd(x, y, 1);
    		}
    	} else {
    		int h; cin >> h;
    		cout << qry(h) << '\n';
    	}
    }
    return 0;
}

• Subtask 1: 22 / 22
• Subtask 2: 27 / 27
• Subtask 3: 51 / 51