Submission #1008822

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1008822	2024-06-26 21:20:31	goduadzesaba	Building 4 (JOI20_building4)	C++17	100 / 100	184 ms	68912 KiB

building4

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#include <bits/stdc++.h>
using namespace std;
#define int long long
const int N=1e6+5;
int n,a[N],b[N],dl[N][2],dr[N][2],cnt;
string s;
signed main(){
  ios_base::sync_with_stdio(0);
  cin.tie(0); cout.tie(0);
  cin>>n; a[2*n+1]=b[2*n+1]=1e9+1;
  for (int i=1; i<=2*n; i++) cin>>a[i];
  for (int i=1; i<=2*n; i++) cin>>b[i];
  dl[0][0]=dl[0][1]=dr[0][0]=dr[0][1]=0;
  for (int i=1; i<=2*n; i++){
    dl[i][0]=dl[i][1]=2*n;
    dr[i][0]=dr[i][1]=-1;
    if (a[i]>=a[i-1]){
      dl[i][0]=min(dl[i][0],dl[i-1][0]+1);
      dr[i][0]=max(dr[i][0],dr[i-1][0]+1);
    }
    if (a[i]>=b[i-1]){
      dl[i][0]=min(dl[i][0],dl[i-1][1]+1);
      dr[i][0]=max(dr[i][0],dr[i-1][1]+1);
    }
    if (b[i]>=a[i-1]){
      dl[i][1]=min(dl[i][1],dl[i-1][0]);
      dr[i][1]=max(dr[i][1],dr[i-1][0]);
    }
    if (b[i]>=b[i-1]){
      dl[i][1]=min(dl[i][1],dl[i-1][1]);
 
 
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• Subtask 1: 11 / 11
• Subtask 2: 89 / 89