View Compilation Error

0_0_32498108_2526.cpp: In function 'int main()':
0_0_32498108_2526.cpp:29:27: error: 'n' was not declared in this scope
     while(~scanf("%d %d",&n,&m))
                           ^
0_0_32498108_2526.cpp:29:30: error: 'm' was not declared in this scope
     while(~scanf("%d %d",&n,&m))
                              ^