#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)
        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，a[n]，i;
    ^
/sandbox/1/a.c:3:8: warning: treating Unicode character <U+FF0C> as identifier character rather than as ',' symbol [-Wunicode-homoglyph]
{int n，a[n]，i;
      ^~
/sandbox/1/a.c:3:13: error: use of undeclared identifier 'n'
{int n，a[n]，i;
          ^
/sandbox/1/a.c:3:15: warning: treating Unicode character <U+FF0C> as identifier character rather than as ',' symbol [-Wunicode-homoglyph]
{int n，a[n]，i;
            ^~
/sandbox/1/a.c:3:15: error: expected ';' at end of declaration
{int n，a[n]，i;
            ^
            ;
/sandbox/1/a.c:4:11: warning: treating Unicode character <U+FF0C> as identifier character rather than as ',' symbol [-Wunicode-homoglyph]
scanf("%d"，&n);
          ^~
/sandbox/1/a.c:4:11: error: expected ')'
/sandbox/1/a.c:4:6: note: to match this '('
scanf("%d"，&n);
     ^
/sandbox/1/a.c:5:5: error: use of undeclared identifier 'i'
for(i=0;i<n;i++)
    ^
/sandbox/1/a.c:5:9: error: use of undeclared identifier 'i'
for(i=0;i<n;i++)
        ^
/sandbox/1/a.c:5:11: error: use of undeclared identifier 'n'
for(i=0;i<n;i++)
          ^
/sandbox/1/a.c:5:13: error: use of undeclared identifier 'i'
for(i=0;i<n;i++)
            ^
/sandbox/1/a.c:6:1: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
   {scanf("%d",&a[i]);
^
/sandbox/1/a.c:6:3: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
   {scanf("%d",&a[i]);
 ^
/sandbox/1/a.c:6:5: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
   {scanf("%d",&a[i]);
  ^
/sandbox/1/a.c:6:20: error: use of undeclared identifier 'a'
   {scanf("%d",&a[i]);
                ^
/sandbox/1/a.c:6:22: error: use of undeclared identifier 'i'
   {scanf("%d",&a[i]);
                  ^
/sandbox/1/a.c:7:1: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
   }
^
/sandbox/1/a.c:7:3: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
   }
 ^
/sandbox/1/a.c:7:5: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
   }
  ^
/sandbox/1/a.c:8:4: warning: treating Unicode character as whitespace [-Wunicode-whitespace]
int equal=1;
   ^
/sandbox/1/a.c:9:5: error: use of undeclared identifier 'i'
for(i=1;i<n;i++)
    ^
/sandbox/1/a.c:9:9: error: use of undeclared identifier 'i'
for(i=1;i<n;i++)
        ^
/sandbox/1/a.c:9:11: error: use of undeclared identifier 'n'
for(i=1;i<n;i++)
          ^
/sandbox/1/a.c:9:13: error: use of undeclared identifier 'i'
for(i=1;i<n;i++)
            ^
/sandbox/1/a.c:10:5: error: use of undeclared identifier 'a'
{if(a[i]!=a[0])
    ^
/sandbox/1/a.c:10:7: error: use of undeclared identifier 'i'
{if(a[i]!=a[0])
      ^
/sandbox/1/a.c:10:11: error: use of undeclared identifier 'a'
{if(a[i]!=a[0])
          ^
/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;}
 ^
18 warnings and 16 errors generated.