View Compilation Error

0_0_33256621_12429.cpp: In function 'void pre()':
0_0_33256621_12429.cpp:17:5: error: 'c' was not declared in this scope
     c[i][j]=1;
     ^
0_0_33256621_12429.cpp:21:5: error: 'c' was not declared in this scope
     c[i][j]=0;
     ^