/in/foo.cc: In function 'void MinCostMaxFlow()':
/in/foo.cc:5:12: error: 'Spfa' was not declared in this scope
 while(Spfa())Adjust();
            ^
/in/foo.cc:5:21: error: 'Adjust' was not declared in this scope
 while(Spfa())Adjust();
                     ^
/in/foo.cc:6:1: error: 'ans' was not declared in this scope
 ans=exp(-ans);
 ^~~
/in/foo.cc:6:13: error: 'exp' was not declared in this scope
 ans=exp(-ans);
             ^
/in/foo.cc:10:12: error: 'printf' was not declared in this scope
 printf("0.");
            ^
/in/foo.cc:22:21: error: 'printf' was not declared in this scope
 else printf("1.0000");
                     ^