View Compilation Error

0_0_26181639_24603.cpp: In function 'll C(ll, ll)':
0_0_26181639_24603.cpp:8:8: error: 'n' was not declared in this scope
     if(n<0||m<0||n<m)return 0;
        ^
0_0_26181639_24603.cpp:8:13: error: 'm' was not declared in this scope
     if(n<0||m<0||n<m)return 0;
             ^