Submission #211738

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
211738	2020-03-21 06:04:45	nibnalin	Building 4 (JOI20_building4)	C++17	100 / 100	450 ms	105848 KiB

building4

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#include <iostream>
#include <cstdio>
#include <vector>
using namespace std;
const int maxn = int(1e6)+5, inf = int(1e9)+5;
int n, A[maxn], B[maxn];
pair<int, int> memo[maxn][2];
pair<int, int> DP(int idx, int prev)
{
  if(idx > 2*n) return {0, 0};
  else if(memo[idx][prev].first != -1) return memo[idx][prev];
  else
  {
    int p = prev?B[idx-1]:A[idx-1];
    pair<int, int> res = {inf, -inf}, tmp;
    if(A[idx] >= p)
    {
      tmp = DP(idx+1, 0);
      res.first = min(res.first, tmp.first+1);
      res.second = max(res.second, tmp.second+1);
    }
    if(B[idx] >= p)
    {
      tmp = DP(idx+1, 1);
      res.first = min(res.first, tmp.first);
      res.second = max(res.second, tmp.second);
    }
 
 
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Compilation message (stderr)

building4.cpp: In function 'int main()':
building4.cpp:38:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
building4.cpp:39:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i = 1;i <= 2*n;i++) scanf("%d", &A[i]);
                              ~~~~~^~~~~~~~~~~~~
building4.cpp:40:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i = 1;i <= 2*n;i++) scanf("%d", &B[i]);
                              ~~~~~^~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 89 / 89