Submission #6687061

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Source Code Expand

#include <iostream>

using namespace std;

int n;
int a[100005];

int main(void)
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> n;
	for(int i = 1; i <= n; i++) cin >> a[i];
	
	for(int i = 1; i <= n; i++){
		if(a[i-1] > a[i]){
			cout << "No" << endl;
			return 0;
		}
		if(a[i-1] < a[i]) a[i]--;
	}
	cout << "Yes" << endl;
	
	return 0;
}

Submission Info

Judge Result