Submission #1099566

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1099566	2024-10-11 16:15:10	imarn	Building 4 (JOI20_building4)	C++14	100 / 100	191 ms	63828 KiB

building4

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#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define plx pair<ll,int>
#define f first
#define s second
#define pb push_back
#define all(x) x.begin(),x.end()
#define vi vector<int>
#define vl vector<ll>
#define vvi vector<vi>
using namespace std;
const ll inf=123456789,mxn=1e6+5;
int dpl[2][mxn]{0},dpr[2][mxn]{0},a[mxn],b[mxn];
int prl[2][mxn],prr[2][mxn];
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    int n;cin>>n;
    for(int i=0;i<2*n;i++)cin>>a[i];
    for(int i=0;i<2*n;i++)cin>>b[i];
    dpl[0][0]=1;dpl[1][0]=0;prl[0][0]=prl[1][0]=-1;
    for(int i=1;i<2*n;i++){
        dpl[0][i]=dpl[1][i]=-1e9;
        if(a[i]>=a[i-1]&&dpl[0][i]<dpl[0][i-1]+1)dpl[0][i]=dpl[0][i-1]+1,prl[0][i]=0;
        if(a[i]>=b[i-1]&&dpl[0][i]<dpl[1][i-1]+1)dpl[0][i]=dpl[1][i-1]+1,prl[0][i]=1;
        if(b[i]>=a[i-1]&&dpl[1][i]<dpl[0][i-1])dpl[1][i]=dpl[0][i-1],prl[1][i]=0;
        if(b[i]>=b[i-1]&&dpl[1][i]<dpl[1][i-1])dpl[1][i]=dpl[1][i-1],prl[1][i]=1;
    }dpr[0][2*n-1]=0,dpr[1][2*n-1]=1;prr[0][2*n-1]=prr[1][2*n-1]=-1;
    for(int i=2*n-2;i>=0;i--){
 
 
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• Subtask 1: 11 / 11
• Subtask 2: 89 / 89