View Compilation Error

0_0_33836656_12259.cpp: In function 'void init()':
0_0_33836656_12259.cpp:54:17: error: 'num' was not declared in this scope
                 num.insert(a[i][j]);
                 ^
0_0_33836656_12259.cpp:58:9: error: 'num' was not declared in this scope
     cnt=num.size();
         ^