View Compilation Error

0_0_25818312_7619.cpp: In function 'int main()':
0_0_25818312_7619.cpp:75:21: error: 'spfa' was not declared in this scope
   int res=spfa(s,t,n);
                     ^
0_0_25818312_7619.cpp:76:35: error: 'INF' was not declared in this scope
   printf("Case %d: %d\n",cas,res==INF?-1:res);
                                   ^