View Compilation Error

0_0_17569115_15161.cpp: In function 'void Init()':
0_0_17569115_15161.cpp:19:9: error: 'num' was not declared in this scope
         num[i].clear();  
         ^
0_0_17569115_15161.cpp:20:9: error: 'pre' was not declared in this scope
         pre[i] = i;  
         ^
0_0_17569115_15161.cpp:21:9: error: 'dist' was not declared in this scope
         dist[i] = 0;  
         ^