Submission #25399

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
25399	2017-06-22 04:17:58	khsoo01	Watching (JOI13_watching)	C++11	100 / 100	483 ms	33472 KiB

watching

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#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll inf = 1e18;
ll n, x[2005], a, b, na[2005], nb[2005];
ll dt[2005][2005];
bool can (ll P) {
  for(ll i=1;i<=n;i++) {
    na[i] = lower_bound(x+1, x+1+n, x[i]+P) - x - 1;
    nb[i] = lower_bound(x+1, x+1+n, x[i]+2*P) - x - 1;
    for(ll j=0;j<=i;j++) dt[i][j] = inf;
  }
  for(ll i=1;i<=n;i++) {
    for(ll j=0;j<i;j++) {
      dt[na[i]][j] = min(dt[na[i]][j], dt[i-1][j] + 1);
      dt[nb[i]][j+1] = min(dt[nb[i]][j+1], dt[i-1][j]);
    }
  }
  for(ll i=0;i<=b;i++) if(dt[n][i] <= a) return true;
  return false;
}
int main()
{
  scanf("%lld%lld%lld",&n,&a,&b);
  if(a + b >= n) {puts("1"); return 0;}
  for(ll i=1;i<=n;i++) scanf("%lld",&x[i]);
  sort(x+1, x+1+n);
  ll S = 1, E = inf;
 
 
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Compilation message (stderr)

watching.cpp: In function 'int main()':
watching.cpp:26:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld%lld",&n,&a,&b);
                                ^
watching.cpp:28:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(ll i=1;i<=n;i++) scanf("%lld",&x[i]);
                                          ^

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