View Compilation Error

0_0_16707768_14370.cpp: In function 'int main()':
0_0_16707768_14370.cpp:97:21: error: 'n' was not declared in this scope
   scanf("%d%d%d%d",&n,&m,&s,&t);
                     ^
0_0_16707768_14370.cpp:97:24: error: 'm' was not declared in this scope
   scanf("%d%d%d%d",&n,&m,&s,&t);
                        ^
0_0_16707768_14370.cpp:97:27: error: 's' was not declared in this scope
   scanf("%d%d%d%d",&n,&m,&s,&t);
                           ^
0_0_16707768_14370.cpp:97:30: error: 't' was not declared in this scope
   scanf("%d%d%d%d",&n,&m,&s,&t);
                              ^
0_0_16707768_14370.cpp:99:10: error: 'in' was not declared in this scope
   memset(in,0,sizeof(in));
          ^
0_0_16707768_14370.cpp:100:10: error: 'out' was not declared in this scope
   memset(out,0,sizeof(out));
          ^
0_0_16707768_14370.cpp:134:26: error: 'flow' was not declared in this scope
   int res=flow(0,n+1,cost);
                          ^