Submission #1401545

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Source Code Expand

#define _CRT_SECURE_NO_WARNINGS
#include <cstdio>
#include <cstring>
using namespace std;

int main()
{
    const char *YES = "YES";
    const char *NO = "NO";

    const char A = 'A';
    const char *Un = "Un";

    int N;

    if (scanf("%d", &N) < 1) return 0;

    char tmp[3];

    int t = 0;
    for (int i = 0; i < N; i++)
    {
        if (scanf("%s", tmp) < 1) return 0;

        if (tmp[0] == A) t++;
        else if (strcmp(tmp, Un) == 0)
        {
            t--;
            if (t < 0) break;
        }
    }

    printf("%s\n", t == 0 ? YES : NO);
    return 0;
}

Submission Info

Judge Result