View Compilation Error

0_0_23829861_5156.cpp: In function 'int check()':
0_0_23829861_5156.cpp:28:13: error: 'i' was not declared in this scope
         for(i=0;i<n;i++)
             ^
0_0_23829861_5156.cpp:29:17: error: 'j' was not declared in this scope
             for(j=i+1;j<n;j++)
                 ^