제출 #707943

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
707943		Dan4Life	구경하기 (JOI13_watching)	C++17	100 / 100	287 ms	16084 KiB

watching

#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
const int mxN = (int)2e3+10;
const int LINF = (int)1e9;
int n, p, q;
int a[mxN], P[mxN], Q[mxN], v[mxN], dp[mxN][mxN];

bool work(int w){
	for(int i=2,j=1,k=1; i <= n; i++){
		v[i]=v[i-1]+a[i]-a[i-1];
		P[i]=upper_bound(v+1,v+i+1,v[i]-w)-begin(v)-1,
		Q[i]=upper_bound(v+1,v+i+1,v[i]-2*w)-begin(v)-1;
	}
	for(int i = 1; i <= n; i++){
		for(int j = 0; j <= q; j++){
			dp[i][j] = min(LINF, dp[P[i]][j]+1);
			if(j) dp[i][j] = min(dp[i][j], dp[Q[i]][j-1]);
		}
	}
	return dp[n][q]<=p;
}

int32_t main() {
	ios_base::sync_with_stdio(false); cin.tie(0);
	cin >> n >> p >> q;
	for(int i = 1; i <= n; i++) cin >> a[i];
	sort(a+1,a+n+1); v[1]=a[1];
	if(p+q>=n){cout<<1;return 0;}
	int l = 1, r = (int)1e9;
	while(l<r){
		int mid = (l+r)/2;
		if(work(mid)) r=mid;
		else l=mid+1;
	}
	cout << l;
}

컴파일 시 표준 에러 (stderr) 메시지

watching.cpp: In function 'bool work(int)':
watching.cpp:13:14: warning: unused variable 'j' [-Wunused-variable]
   13 |  for(int i=2,j=1,k=1; i <= n; i++){
      |              ^
watching.cpp:13:18: warning: unused variable 'k' [-Wunused-variable]
   13 |  for(int i=2,j=1,k=1; i <= n; i++){
      |                  ^

• Subtask 1: 50 / 50
• Subtask 2: 50 / 50