/in/foo.cc: In function 'int main()':
/in/foo.cc:6:17: warning: unused variable 'j' [-Wunused-variable]
     int ans=0,i,j,k=0,l,n,m;
                 ^
/in/foo.cc: At global scope:
/in/foo.cc:22:13: error: redefinition of 'int a [100001]'
 int a[100001];
             ^
/in/foo.cc:3:5: note: 'int a [100001]' previously declared here
 int a[100001];
     ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:23:5: error: redefinition of 'int main()'
 int main()
     ^~~~
/in/foo.cc:4:5: note: 'int main()' previously defined here
 int main()
     ^~~~
/in/foo.cc:25:17: warning: unused variable 'j' [-Wunused-variable]
     int ans=0,i,j,k=0,l,n,m;
                 ^