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LEPERMUT.cpp
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40 lines (38 loc) · 795 Bytes
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#include <iostream>
#include <cstring>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
int t;
cin>>t;
while (t--) {
int n;
cin>>n;
vector <int> v;
for(int i = 0 , x ; i < n ; i++){
cin>>x;
v.push_back(x);
}
int numInv=0, numLocal=0;
for(int i = 0 ; i < n ; i ++){
for(int j = i+1; j < n ; j++){
if(v[i]>v[j]){
numInv+=1;
}
}
}
for(int i = 0 ; i < n-1 ; i++){
if(v[i] > v[i+1]){
numLocal+=1;
}
}
if(numLocal == numInv){
cout<<"YES\n";
}
else{
cout<<"NO\n";
}
}
return 0;
}