View Compilation Error

0_0_15421447_10984.cpp:2:1: error: 'CostFlow' does not name a type
 CostFlow<50 * 50 * 2 + 2,int> F;
 ^
0_0_15421447_10984.cpp: In function 'int work()':
0_0_15421447_10984.cpp:8:5: error: 'F' was not declared in this scope
     F.init();
     ^
0_0_15421447_10984.cpp: In function 'int main()':
0_0_15421447_10984.cpp:40:20: error: 'scanf' was not declared in this scope
     scanf("%d",&cas);
                    ^
0_0_15421447_10984.cpp:58:44: error: 'printf' was not declared in this scope
         printf("Case #%d: %d\n",++ca,work());
                                            ^