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user_8384735
c_cpp
2 years ago
264 B
7
Indexable
#include<iostream>
using namespace std;
int n, l, x;
int main(){
	cin >> n >> l;
	int _2 = l / 2 + (l & 1);
	while (n--){
		cin >> x;
		if (x == 1) _2 -= _2 > 0;
		else if (x == 2 && _2 >= 2) _2 -= 2;
		else _2--;
	}
	cout << (_2 < 0 ? "No": "Yes");
}
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