#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;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
212 KB |
Output is correct |
2 |
Correct |
16 ms |
832 KB |
Output is correct |
3 |
Correct |
16 ms |
804 KB |
Output is correct |
4 |
Correct |
16 ms |
852 KB |
Output is correct |
5 |
Correct |
16 ms |
808 KB |
Output is correct |
6 |
Correct |
17 ms |
880 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
0 ms |
212 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
0 ms |
212 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
0 ms |
212 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
0 ms |
212 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |