Submission #23458203

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define u unsigned
#define ull unsigned long long
#define ld long double
#define pb push_back
#define fasterInOut ios::sync_with_stdio(false); cin.tie(0);
#define pi acos(-1)
#define f(i,a,b) for(int i=(a);i<=(b);i++)
#define fr(i,a,b) for(int i=(a);i>=(b);i--)
#define MAX 1000000

void function(int x);

int main()
{
    #ifndef ONLINE_JUDGE
    freopen("C:/Users/ASUS/Desktop/inout/input.txt", "r", stdin);
    freopen("C:/Users/ASUS/Desktop/inout/output.txt", "w", stdout);
    #endif

    int n;
    cin>>n;
    int a[n+1], b[n+1];
    int j=1;
    for(int i=0;i<n;i++){
    	a[i]=j;
    	j++;
    }
    f(i,0,n-1){
    	cin>>b[i];
    }
    sort(b, b+n);
    int cnt=0;
    f(i,0,n-1){
    	if(a[i]!=b[i]){
    		cnt=1;
    		break;
    	}
    }
    if(cnt==0)
    	cout<<"Yes"<<endl;
    else
    	cout<<"No"<<endl;
    
    return 0;
}

Submission Info

Judge Result