View Compilation Error

0_0_32501539_26370.cpp: In function 'int main()':
0_0_32501539_26370.cpp:26:26: error: 'n' was not declared in this scope
     while(scanf("%d %d",&n,&m)!=EOF)
                          ^
0_0_32501539_26370.cpp:26:29: error: 'm' was not declared in this scope
     while(scanf("%d %d",&n,&m)!=EOF)
                             ^
0_0_32501539_26370.cpp:32:29: error: 'temp' was not declared in this scope
                 scanf("%d",&temp);
                             ^
0_0_32501539_26370.cpp:53:29: error: 'k' was not declared in this scope
                 for(int j=0;k<len;k++)
                             ^