Submission #448056

#	Time	Username	Problem	Language	Result	Execution time	Memory
448056		fuad27	Fountain (eJOI20_fountain)	C++14	60 / 100	1579 ms	6288 KiB

fountain

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define endl "\n"
#pragma GCC optimize("Ofast")
int32_t main () {
	int n, q;
	cin >> n >> q;
	vector<int> d(n, 0);
	vector<int> c(n, 0);
	vector<int> prefix(n+1, 0);
	bool increasing = true;
	for(int i=0;i<n;i++) {
		int a, b;
		cin >> a >> b;
		d[i] = a;
		c[i] = b;
		prefix[i+1] = prefix[i] + c[i];
		if(i > 0 and d[i] <= d[i-1])increasing = false;
	}
	while(q--) {
		int i, v;
		cin >> i >> v;
		i--;
		if(increasing) {
			int l = i, u = n - 1, ans = 0;
			while(l <= u) {
				int mid = l+(u-l)/2;
				if(prefix[mid+1] - prefix[i] >= v) {
					ans = mid;
					u = mid - 1;
				}
				else {
					l = mid + 1;
				}
			}
			if(prefix[n] < v) {
				cout<<0<<endl;
			}
			else
				cout<<ans+1<<endl;
		}
		else {
			int prev = i;
			while(v > 0 and i < n) {
				if(prev == i)v-=c[i];
				else if(d[i] > d[prev]) {
					v-=c[i];
					prev = i;
				}
				i++;
			}
			if(v > 0)cout<<0<<endl;
			else cout<<i<<endl;
		}
	}
}

• Subtask 1: 30 / 30
• Subtask 2: 30 / 30
• Subtask 3: 0 / 40