Submission #24843

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
24843	2017-06-15 08:20:27	nibnalin	Watching (JOI13_watching)	C++14	100 / 100	333 ms	17744 KiB

watching

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#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
using namespace std;
const int maxn = int(2e3)+5, inf = int(1e9)+5;
int n, p, q, A[maxn], nex[maxn][2], memo[maxn][maxn];
bool f(int w)
{
  for(int idx = n-1;idx >= 0;idx--)
  {
    nex[idx][0] = int(lower_bound(A, A+n, A[idx]+w)-A);
    nex[idx][1] = int(lower_bound(A, A+n, A[idx]+min(inf, 2*w))-A);
    for(int pp = 0;pp <= p;pp++)
    {
      memo[idx][pp] = inf;
      if(pp) memo[idx][pp] = min(memo[idx][pp], memo[nex[idx][0]][pp-1]);
      memo[idx][pp] = min(memo[idx][pp], memo[nex[idx][1]][pp]+1);
    }
  }
  //cout << w << " " << memo[0][p] << "\n";
  return (memo[0][p] <= q);
}
int main(void)
{
 
 
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Compilation message (stderr)

watching.cpp: In function 'int main()':
watching.cpp:31:29: 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:33:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i = 0;i < n;i++) scanf("%d", &A[i]);
                                             ^

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