Submission #944651

#	Time	Username	Problem	Language	Result	Execution time	Memory
944651		hmm789	A Difficult(y) Choice (BOI21_books)	C++14	100 / 100	1 ms	1364 KiB

books

#include <bits/stdc++.h>
#include "books.h"
using namespace std;

void solve(int N, int K, long long A, int S) {
	vector<int> v;
    #define int long long
    int l = 1, r = N+1, m, front = 0;
    int a[N+1];
    memset(a, -1, sizeof(a));
    for(int i = 1; i <= K; i++) {
		a[i] = skim(i);
		front += a[i];
	}
	if(front > 2*A) impossible();
	else if(front >= A) {
		for(int i = 1; i <= K; i++) v.push_back(i);
		answer(v);
	}
    while(l < r) {
		m = (l+r)/2;
		if(a[m] == -1) a[m] = skim(m);
		if(a[m] < A) l = m+1;
		else r = m;
	}
	if(l != N+1) {
		if(a[l] == -1) a[l] = skim(l);
		front += a[l]-a[K];
		if(front <= 2*A) {
			for(int i = 1; i < K; i++) v.push_back(i);
			v.push_back(l);
			answer(v);
		}
		front += a[K]-a[l];
	}
	for(int i = l-1; i >= max(l-K, 1LL); i--) {
		if(a[i] == -1) a[i] = skim(i);
	}
	for(int i = K; i >= 1; i--) {
		front += a[l-K+i-1] - a[i];
		if(front >= A) {
			for(int j = 1; j < i; j++) v.push_back(j);
			for(int j = i; j <= K; j++) v.push_back(l-K+j-1);
			answer(v);
		}
	}
	impossible();
	#undef int
}

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 15 / 15
• Subtask 5: 15 / 15
• Subtask 6: 20 / 20
• Subtask 7: 20 / 20