View Compilation Error

0_0_25481425_5343.cpp: In function 'int main()':
0_0_25481425_5343.cpp:49:25: error: 'n' was not declared in this scope
  while(~scanf("%d%d%d",&n,&x,&y)){
                         ^
0_0_25481425_5343.cpp:49:28: error: 'x' was not declared in this scope
  while(~scanf("%d%d%d",&n,&x,&y)){
                            ^
0_0_25481425_5343.cpp:49:31: error: 'y' was not declared in this scope
  while(~scanf("%d%d%d",&n,&x,&y)){
                               ^
0_0_25481425_5343.cpp:51:16: error: 'ar' was not declared in this scope
    scanf("%d",&ar[i]);
                ^
0_0_25481425_5343.cpp:53:6: error: 'ar' was not declared in this scope
   MS(ar,0,n-1);
      ^