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Submission #466702

# Submission time Handle Problem Language Result Execution time Memory
466702 2021-08-20T10:13:36 Z Clan328 Fountain (eJOI20_fountain) C++17
100 / 100
 531 ms 46944 KB 
#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define nL '\n'
#define all(x) (x).begin(), (x).end()

typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<pll> vpll;

vvl up;
vvl sum;

int main() {
	#ifdef LOCAL
		freopen("io/input.txt", "r", stdin);
		freopen("io/output.txt", "w", stdout);
	#endif

	ios::sync_with_stdio(0);
	cin.tie(0);

	ll n, q;
	cin >> n >> q;
	vpll input(n+1);
	for (int i = 1; i <= n; i++)
		cin >> input[i].first >> input[i].second;

	ll LOG = 19;
	up = vvl(n+2, vl(LOG+1));
	sum = vvl(n+2, vl(LOG+1));
	
	stack<ll> stk;
	for (int i = n; i > 0; i--) {
		while (!stk.empty() && input[stk.top()].first <= input[i].first)
			stk.pop();
		if (!stk.empty())
			up[i][0] = stk.top();
		else
			up[i][0] = n+1;
		sum[i][0] = input[i].second;
		stk.push(i);
	}

	sum[n+1][0] = 1e18;
	for (ll j = 1; j < LOG; j++) {
		sum[n+1][j] = 1e18;
		for (ll v = 1; v <= n; v++) {
			up[v][j] = up[up[v][j-1]][j-1];
			sum[v][j] = sum[v][j-1] + sum[up[v][j-1]][j-1];
		}
	}

	while (q--) {
		ll r;
		ll v;
		cin >> r >> v;

		for (ll i = LOG-1; i >= 0; i--) {
			if (sum[r][i] < v) {
				v -= sum[r][i];
				r = up[r][i];
			}
		}

		cout << (r <= n? r : 0) << nL;
	}

	return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 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 1 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 708 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 353 ms 40596 KB Output is correct
2 Correct 375 ms 40584 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 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 1 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 708 KB Output is correct
8 Correct 353 ms 40596 KB Output is correct
9 Correct 375 ms 40584 KB Output is correct
10 Correct 2 ms 716 KB Output is correct
11 Correct 158 ms 25348 KB Output is correct
12 Correct 531 ms 46944 KB Output is correct
13 Correct 373 ms 46000 KB Output is correct
14 Correct 280 ms 45128 KB Output is correct
15 Correct 223 ms 45472 KB Output is correct