View Compilation Error

0_0_38641012_8835.cpp: In function 'int main()':
0_0_38641012_8835.cpp:79:24: error: 's' was not declared in this scope
   cout << "Case " << ++s << ": " << dinic() << endl;
                        ^
0_0_38641012_8835.cpp:79:24: note: suggested alternative: 'ss'
   cout << "Case " << ++s << ": " << dinic() << endl;
                        ^
                        ss