oj.uz

Submission #559993

# Submission time Handle Problem Language Result Execution time Memory
559993 2022-05-11T02:35:43 Z amunduzbaev Sparklers (JOI17_sparklers) C++17
0 / 100
 1 ms 212 KB 
#include "bits/stdc++.h"
using namespace std;

#define ar array
#define int long long

const int inf = 1e9 + 5;

signed main(){
	ios::sync_with_stdio(0); cin.tie(0);
	
	int n, k, t; cin>>n>>k>>t;
	
	vector<int> a(n), d(n);
	for(int i=0;i<n;i++) cin>>a[i], a[i] *= 2;
	for(int i=1;i<n;i++){
		d[i] = a[i] - a[i-1];
	}
	k--;
	
	auto check = [&](int s){
		int l = k, r = k, pos = t * s;
		while(l || r+1<n){
			int dl = inf, dr = inf;
			if(l) dl = d[l];
			if(r+1<n) dr = d[r+1];
			if(dl <= dr){
				dl /= 2;
				if(dl > pos) return false;
				pos = pos - dl + t * s, l--;
			} else {
				dr /= 2;
				if(dr > pos) return false;
				pos = pos - dr + t * s, r++;
			}
		}
		
		return true;
	};
	
	int l = 0, r = 2 * inf;
	while(l < r){
		int m = (l + r) >> 1;
		if(check(m)) r = m;
		else l = m + 1;
	}
	
	cout<<(l+1) / 2<<"\n";
}

Subtask #1
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Incorrect 0 ms 212 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Incorrect 0 ms 212 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Incorrect 0 ms 212 KB Output isn't correct
8 Halted 0 ms 0 KB -