Submission #1305220

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Source Code Expand

#include <iostream>
#include <string>

using namespace std;
#define REP(i,n) for(int i = 0; i < (int)(n); i++)
bool solve() {
	int N; cin>>N;
	int a = 0, u = 0;
	REP(i,N) {
		string w; cin>>w;
		if(w == "A") a++;
		else if(w == "Un") u++;
		if(a - u < 0) return false;
	}
	return a == u;
}

int main() {
	bool ans = solve();
	cout << (ans ? "YES" : "NO") << endl;
	return 0;
}

Submission Info

Judge Result