#include  < stdio.h>
int main () {
    int n, i;
    scanf("%d", &n);
    int a[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)
        printf("Yes\n");
    else
        printf("No\n");
    return 0;
}

/sandbox/1/a.c:1:9: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
#include <stdio.h>
        ^
/sandbox/1/a.c:2:4: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
int main ()
   ^
/sandbox/1/a.c:2:10: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
int main ()
        ^
/sandbox/1/a.c:3:5: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
{int n,i;
    ^
/sandbox/1/a.c:7:1: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
   {scanf("%d"&a[i]);}
^
/sandbox/1/a.c:7:3: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
   {scanf("%d"&a[i]);}
 ^
/sandbox/1/a.c:7:5: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
   {scanf("%d"&a[i]);}
  ^
/sandbox/1/a.c:7:18: error: invalid operands to binary expression ('char [3]' and 'int')
   {scanf("%d"&a[i]);}
          ~~~~^~~~~
/sandbox/1/a.c:8:4: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
int equal=1;
   ^
/sandbox/1/a.c:11:1: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
  {equal=0;
^
/sandbox/1/a.c:11:3: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
  {equal=0;
 ^
/sandbox/1/a.c:12:1: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
  break;}
^
/sandbox/1/a.c:12:3: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
  break;}
 ^
12 warnings and 1 error generated.