Submission #598406

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
598406	2022-07-18 09:24:37	jk410	Building 4 (JOI20_building4)	C++17	100 / 100	339 ms	139280 KiB

building4

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#include <bits/stdc++.h>
#define all(v) v.begin(),v.end()
using namespace std;
const int INF=1e9;
struct itv{
    int l,r;
};
itv operator+(itv a,itv b){
    return {min(a.l,b.l),max(a.r,b.r)};
}
int N;
int A[1000001],B[1000001];
itv DP[1000001][2];
string Ans;
itv dp(int i,int j){
    itv &ret=DP[i][j];
    if (ret.l!=-1||ret.r!=-1)
        return ret;
    ret={INF,-1};
    int tmp=(j?B[i]:A[i]);
    if (A[i-1]<=tmp&&(dp(i-1,0).l!=INF||dp(i-1,0).r!=-1))
        ret=ret+dp(i-1,0);
    if (B[i-1]<=tmp&&(dp(i-1,1).l!=INF||dp(i-1,1).r!=-1))
        ret=ret+dp(i-1,1);
    if (ret.l==INF&&ret.r==-1)
        return ret;
    if (!j){
        ret.l++;
        ret.r++;
    }
 
 
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• Subtask 1: 11 / 11
• Subtask 2: 89 / 89