oj.uz

답안 #467295

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
467295 2021-08-22T12:27:52 Z syrtin Fountain (eJOI20_fountain) C++17
100 / 100
 443 ms 53552 KB 
/*author:	syrtin*/
#include <bits/stdc++.h>

#define pb push_back
#define all(v) v.begin(),v.end()
#define ff first
#define ss second

using namespace std;

typedef long long ll;
typedef pair<long long, long long> pll;
typedef pair < int, int > pii;
typedef vector<int> vi;
typedef vector<long long> vll;

const int N = 1e6 + 1;
const ll MOD = 1e9 + 7;
const int inf = int(1e9);
const ll INF = ll(1e16);

void SOLVE(/*WATLE*/) {
	int n, q;
	cin >> n >> q;
	ll c[n], d[n];
	pll go[n + 4][32];
	stack<int> s;
	for(int i = 0; i < n; i++) {
		cin >> d[i] >> c[i];
	}
	for(int i = 0; i < 32; i++) go[n - 1][i] = {n + 1, c[n - 1]}, go[n + 1][i] = {n + 1, 0};
	s.push(n - 1);
	for(int i = n - 2; i >= 0; i--) {
		while(!s.empty() && d[i] >= d[s.top()]) {
			s.pop();
		}
		if(!s.empty()){
			go[i][0] = {s.top(), c[i]};
			for(int o = 1; o < 32; o++) go[i][o] = {go[go[i][o - 1].ff][o - 1].ff, go[i][o - 1].ss + go[go[i][o - 1].ff][o - 1].ss};
		}
		else for(int o = 0; o < 32; o++) go[i][o] = {n + 1, c[i]};
		s.push(i);
	}
	while(q--) {
		ll j, x;
		cin >> j >> x;
		if(go[j - 1][31].ss < x)cout << 0 << '\n';
		else {
			j--;
			while(go[j][0].ss < x) {
				for(int o = 31; o >= 0; o--) {
					if(go[j][o].ss < x) {
						x -= go[j][o].ss, j = go[j][o].ff;
						break;
					}
				}
			}
			cout << j + 1 << '\n';
		}
	}
}

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
    int times = 1;
	//cin >> times;
    for(int i = 1; i <= times; i++) {
        //cout << "Case #" << t << ": ";
        SOLVE();
    }
    return 0;
}

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 460 KB Output is correct
3 Correct 1 ms 588 KB Output is correct
4 Correct 2 ms 716 KB Output is correct
5 Correct 2 ms 716 KB Output is correct
6 Correct 2 ms 716 KB Output is correct
7 Correct 2 ms 716 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 330 ms 50532 KB Output is correct
2 Correct 336 ms 46680 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 460 KB Output is correct
3 Correct 1 ms 588 KB Output is correct
4 Correct 2 ms 716 KB Output is correct
5 Correct 2 ms 716 KB Output is correct
6 Correct 2 ms 716 KB Output is correct
7 Correct 2 ms 716 KB Output is correct
8 Correct 330 ms 50532 KB Output is correct
9 Correct 336 ms 46680 KB Output is correct
10 Correct 2 ms 792 KB Output is correct
11 Correct 139 ms 29420 KB Output is correct
12 Correct 443 ms 53552 KB Output is correct
13 Correct 321 ms 53312 KB Output is correct
14 Correct 204 ms 53084 KB Output is correct
15 Correct 181 ms 53080 KB Output is correct