Submission #657602

#	Time	Username	Problem	Language	Result	Execution time	Memory
657602		TimDee	A Difficult(y) Choice (BOI21_books)	C++17	0 / 100	13 ms	208 KiB

books

#include"books.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
void solve(int n, int k, ll A, int s) {
	if (s!=n) return;
	vector<ll> a(n);
	for (int i=0; i<n; ++i) a[i]=skim(i+1);
	if (k==3) {

		for (int i=0; i<n; ++i) {
			for (int j=i+1; j<n; ++j) {
				int l=j+1, r=n-1;
				ll sum1 = a[i]+a[j];
				while (l<r) {
					int mid=(l+r)>>1;
					if (sum1+a[mid]<A) l=mid+1;
					else r=mid;
				}
				ll sum=sum+a[r];
				if (sum>=A && sum<=2*A) {
					answer({i+1,j+1,r+1});
					return;
				}
			}
		}
		impossible();

	}
}

Compilation message (stderr)

books.cpp: In function 'void solve(int, int, ll, int)':
books.cpp:20:19: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]
   20 |     ll sum=sum+a[r];
      |                   ^

• 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