Submission #6687918

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
int a,b,c,d,e,f[100009];
int main(){
	ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
	cin>>a;
	for(b=1; b<=a; b++){
		cin>>f[b];
	}
	f[1]--;
	for(b=2; b<=a; b++){
		if(f[b]>f[b-1]) f[b]--;
		if(f[b]<f[b-1]){
			cout<<"No";
			return 0;
		}
	}
	cout<<"Yes";
	return 0;
}

Submission Info

Judge Result