Submission #59139

#	Time	Username	Problem	Language	Result	Execution time	Memory
59139		RezwanArefin01	Watching (JOI13_watching)	C++17	0 / 100	147 ms	16896 KiB

watching

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

typedef long long ll;
typedef pair<int, int> ii; 

const int N = 2010; 
int n, p, q, a[N], dp[N][N], w;

int f(int pos, int tot) {
	if(pos == n) return 0; 
	int &ret = dp[pos][p]; 
	if(~ret) return ret; 
	ret = 1e9;
	int x = lower_bound(a + pos, a + n, a[pos] + w) - a;
	int y = lower_bound(a + pos, a + n, a[pos] + w  + w) - a;
	if(tot < p) ret = f(x, tot + 1); 
	return ret = min(ret, 1 + f(y, tot)); 
}
int main(int argc, char const *argv[]) {
	scanf("%d %d %d", &n, &p, &q); 
	for(int i = 0; i < n; i++) 
		scanf("%d", &a[i]); 
	p = min(p, n); 
	sort(a, a + n);
	int lo = 1, hi = 1e9, ans = -1; 
	while(lo <= hi) {
		w = lo + hi >> 1; 
		memset(dp, -1, sizeof dp); 
		if(f(0, 0) <= q) {
			ans = w, hi = w - 1; 
		} else lo = w + 1; 
	} printf("%d\n", ans);
}

Compilation message (stderr)

watching.cpp: In function 'int main(int, const char**)':
watching.cpp:28:10: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   w = lo + hi >> 1; 
       ~~~^~~~
watching.cpp:21:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d", &n, &p, &q); 
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
watching.cpp:23:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]); 
   ~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 50
• Subtask 2: 0 / 50