#include  < stdio.h>
int main () {
    int n，a[n] ，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");
    if (equal == 0)
        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:4:5: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
 int n，a[n]，i;
    ^
/sandbox/1/a.c:4:8: warning: treating Unicode character <U+FF0C> as identifier character rather than as ',' symbol [-Wunicode-homoglyph]
 int n，a[n]，i;
      ^~
/sandbox/1/a.c:4:13: error: use of undeclared identifier 'n'
 int n，a[n]，i;
          ^
/sandbox/1/a.c:4:15: warning: treating Unicode character <U+FF0C> as identifier character rather than as ',' symbol [-Wunicode-homoglyph]
 int n，a[n]，i;
            ^~
/sandbox/1/a.c:4:15: error: expected ';' at end of declaration
 int n，a[n]，i;
            ^
            ;
/sandbox/1/a.c:5:12: warning: treating Unicode character <U+FF0C> as identifier character rather than as ',' symbol [-Wunicode-homoglyph]
 scanf("%d"，&n);
           ^~
/sandbox/1/a.c:5:12: error: expected ')'
/sandbox/1/a.c:5:7: note: to match this '('
 scanf("%d"，&n);
      ^
/sandbox/1/a.c:6:6: error: use of undeclared identifier 'i'
 for(i=0;i<n;i++)
     ^
/sandbox/1/a.c:6:10: error: use of undeclared identifier 'i'
 for(i=0;i<n;i++)
         ^
/sandbox/1/a.c:6:12: error: use of undeclared identifier 'n'
 for(i=0;i<n;i++)
           ^
/sandbox/1/a.c:6:14: error: use of undeclared identifier 'i'
 for(i=0;i<n;i++)
             ^
/sandbox/1/a.c:7:1: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
 {
^
/sandbox/1/a.c:8:17: error: use of undeclared identifier 'a'
    scanf("%d",&a[i]);
                ^
/sandbox/1/a.c:8:19: error: use of undeclared identifier 'i'
    scanf("%d",&a[i]);
                  ^
/sandbox/1/a.c:10:5: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
 int equal=1;
    ^
/sandbox/1/a.c:11:6: error: use of undeclared identifier 'i'
 for(i=1;i<n;i++)
     ^
/sandbox/1/a.c:11:10: error: use of undeclared identifier 'i'
 for(i=1;i<n;i++)
         ^
/sandbox/1/a.c:11:12: error: use of undeclared identifier 'n'
 for(i=1;i<n;i++)
           ^
/sandbox/1/a.c:11:14: error: use of undeclared identifier 'i'
 for(i=1;i<n;i++)
             ^
/sandbox/1/a.c:13:8: error: use of undeclared identifier 'a'
    if(a[i]!=a[0])
       ^
/sandbox/1/a.c:13:10: error: use of undeclared identifier 'i'
    if(a[i]!=a[0])
         ^
/sandbox/1/a.c:13:14: error: use of undeclared identifier 'a'
    if(a[i]!=a[0])
             ^
/sandbox/1/a.c:14:1: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
   {
^
/sandbox/1/a.c:16:1: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
    break;
^
/sandbox/1/a.c:16:3: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
    break;
 ^
12 warnings and 16 errors generated.