#include <stdio.h>
#include <stdlib.h>
void main() {
    int n;
    scanf("%d\n", &n);
    int *p = (int *)malloc(n * sizeof(int));
    int i = 0;
    int j = 0;
    for (i = 0; i < n; i++) {
        scanf("%d", &p[i]);
    }
    for (i = 0; i < n; i++) {
        if (p[0] != p[i]) {
            j = 1;
            break;
        }
    }
    switch (j) {
        case 1:
            printf("No");
            break;
            caes 0 : printf("Yes");
            break;
    }
}

/sandbox/1/a.c:3:1: warning: return type of 'main' is not 'int' [-Wmain-return-type]
void main()
^
/sandbox/1/a.c:3:1: note: change return type to 'int'
void main()
^~~~
int
/sandbox/1/a.c:25:9: error: use of undeclared identifier 'caes'
        caes 0:printf("Yes");break;
        ^
1 warning and 1 error generated.