#include <stdio.h>
int main() {
    int n, a[], i;
    scanf("%d", &n);
    for (i = 0; i < n; i++) {
        scanf("%d", &a[i]);
    }
    int equal = 1;
    for (i = 1; i < n; i++) {
        if (a[i] != a[0]) {
            equal = 0;
            break;
        }
    }
    if (equal == 1)
        printf("Yes\n");
    else
        printf("No\n");
}

/sandbox/1/a.c:3:8: error: definition of variable with array type needs an explicit size or an initializer
{int n,a[],i;
       ^
1 error generated.