Submission #676649

#	Time	Username	Problem	Language	Result	Execution time	Memory
676649		owoovo	Sandcastle 2 (JOI22_ho_t5)	C++14	9 / 100	17 ms	880 KiB

Main

#include<bits/stdc++.h>
#define ll long long
using namespace std;
int ori[500010];
int main(){
    ll n,m;
    cin>>n>>m;
    if(n!=1){
        cout<<"0\n";
        return 0;
    }
    if(m==1){
        cin>>ori[0];
        cout<<"1\n";
        return 0;
    }
    for(int i=0;i<m;i++){
        cin>>ori[i];
    }
    ll ans=0;
    ll nowc=2;
    for(int i=2;i<m;i++){
        if((ori[i]>ori[i-1])^(ori[i-1]>ori[i-2])){
            ans+=nowc*(nowc-1)/2+nowc-1;
            nowc=2;
        }else{
            nowc++;
        }
    }
    ans+=nowc*(nowc-1)/2+nowc;
    cout<<ans<<'\n';
    return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 0 / 10
• Subtask 3: 0 / 5
• Subtask 4: 0 / 56
• Subtask 5: 0 / 20