View Compilation Error

0_0_28930885_23859.cpp: In function 'int main()':
0_0_28930885_23859.cpp:14:13: error: 'j' was not declared in this scope
         for(j=0; j<n; j++)
             ^
0_0_28930885_23859.cpp:16:19: error: redeclaration of 'int j'
             int m,j;
                   ^
0_0_28930885_23859.cpp:14:13: note: '<typeprefixerror>j' previously declared here
         for(j=0; j<n; j++)
             ^