Submission #400531

#	Time	Username	Problem	Language	Result	Execution time	Memory
400531		b00n0rp	A Difficult(y) Choice (BOI21_books)	C++17	0 / 100	1 ms	276 KiB

books

#include <bits/stdc++.h>

#include "books.h"

using namespace std;
//
// --- Sample implementation for the task books ---
//
// To compile this program with the sample grader, place:
//     books.h books_sample.cpp sample_grader.cpp
// in a single folder and run:
//     g++ books_sample.cpp sample_grader.cpp
// in this folder.
//

int a[100005];

void solve(int N, int K, long long A, int S) {
    for(int i = 1; i <= K; i ++) a[i] = skim(i);
    int sm = 0;
	for(int i = 1; i <= K-1; i ++) sm += a[i];
	if(sm+a[K] > 2*A){
		impossible();
		return;
	}
    int low = K,high = N,mid,ans;
	while(low <= high){
		mid = (low+high)/2;
		if(skim(mid)+sm <= 2*A){
			ans = mid;
			low = mid+1;
		}
		else high = mid-1;
	}
	for(int i = ans; i > ans-K; i --){
		sm += skim(i);
		if(sm >= A){
			vector<int> bruh;
			for(int j = i; j <= ans; j++) bruh.push_back(j);
			for(int j = 1; j <= K-(int)bruh.size(); j ++) bruh.push_back(j);
			answer(bruh);
		}
		sm -= a[K-(ans-i)-2];
	}
}

Compilation message (stderr)

books.cpp: In function 'void solve(int, int, long long int, int)':
books.cpp:39:21: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   39 |    for(int j = i; j <= ans; j++) bruh.push_back(j);
      |                   ~~^~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 15
• Subtask 3: 0 / 10
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20