백준 스택 - 10773번 : 제로

https://www.acmicpc.net/problem/10773

10773번: 제로

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import java.io.*;
import java.util.Stack;
public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
		int n = Integer.parseInt(br.readLine());
		Stack<Integer> money = new Stack<>();
		for(int i=0; i<n; i++) {
			int temp = Integer.parseInt(br.readLine());
			if(temp==0) money.pop();
			else money.push(temp);
		}
		long sum = 0;
		while(!money.isEmpty()) {
			sum+=money.pop();
		}
		bw.write(sum+"");
		bw.close();
	}
}