Submission #107687

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
107687	2019-04-25 12:59:26	maruii	Watching (JOI13_watching)	C++14	100 / 100	143 ms	8704 KiB

watching

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#include <bits/stdc++.h>
using namespace std;
int N, P, Q;
unsigned int A[2002], X[2002], Y[2002];
int dp[2001][2001];
int f(int w){
  for(int i=0; i<=N; ++i){
    X[i] = lower_bound(A+i+1, A+N+1, A[i+1]+w) - A - 1;
    Y[i] = lower_bound(A+i+1, A+N+1, A[i+1]+(w<<1)) - A - 1;
  }
  for(int i=0; i<=P; ++i){
    for(int j=0; j<=Q; ++j){
      if(i && j) dp[i][j] = max(X[dp[i-1][j]], Y[dp[i][j-1]]);
      else if(i) dp[i][j] = X[dp[i-1][j]];
      else if(j) dp[i][j] = Y[dp[i][j-1]];
    }
  }
  return dp[P][Q];
}
int main(){
  ios_base::sync_with_stdio(0), cin.tie(0);
  cin>>N>>P>>Q;
  for(int i=1; i<=N; ++i) cin>>A[i];
  sort(A+1, A+N+1);
  A[N+1] = 2e9;
  Q = min(Q, N), P = min(P, N-Q);
  int l=1, r=1e9;
  while(l<r){
    int m = l+r>>1;
    if(f(m) == N) r = m;
 
 
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Compilation message (stderr)

watching.cpp: In function 'int main()':
watching.cpp:29:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m = l+r>>1;
           ~^~

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