Submission #960077

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
960077	2024-04-09 15:43:04	penguin133	Building 4 (JOI20_building4)	C++17	100 / 100	315 ms	147248 KiB

building4

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#include <bits/stdc++.h>
using namespace std;
#define int long long
#define fi first
#define se second
#define pi pair <int, int> 
#define pii pair <int, pi>
int n, A[1000005], B[1000005], memo[1000005][2], memo2[1000005][2];
int dp1(int x, int f){
  if(x == 2 * n)return !f;
  if(memo[x][f] != -1)return memo[x][f];
  int val = (!f ? A[x] : B[x]);
  int tmp = 1e18;
  if(A[x + 1] >= val)tmp = min(tmp, dp1(x + 1, 0));
  if(B[x + 1] >= val)tmp = min(tmp, dp1(x + 1, 1));
  if(!f)tmp++;
  return memo[x][f] = tmp;
}
int dp2(int x, int f){
  if(x == 2 * n)return !f;
  if(memo2[x][f] != -1)return memo2[x][f];
  int val = (!f ? A[x] : B[x]);
  int tmp = -1e18;
  if(A[x + 1] >= val)tmp = max(tmp, dp2(x + 1, 0));
  if(B[x + 1] >= val)tmp = max(tmp, dp2(x + 1, 1));
  if(!f)tmp++;
  return memo2[x][f] = tmp;
}
 
 
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Compilation message (stderr)

building4.cpp:65:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   65 | main(){
      | ^~~~

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