View Compilation Error

0_0_30729360_23816.cpp: In function 'int main()':
0_0_30729360_23816.cpp:29:12: error: 'ok' was not declared in this scope
     memset(ok,0,sizeof(ok));
            ^
0_0_30729360_23816.cpp:62:9: error: 'else' without a previous 'if'
         else
         ^