View Compilation Error

0_0_21953191_5034.cpp: In function 'int MCMF(int, int, int)':
0_0_21953191_5034.cpp:58:12: error: 'd' was not declared in this scope
         if(d[t]>=0) break;
            ^
0_0_21953191_5034.cpp: In function 'int main()':
0_0_21953191_5034.cpp:83:31: error: 'a' was not declared in this scope
             scanf("%d%d%d%d",&a[i],&b[i],&c[i],&d[i]);
                               ^
0_0_21953191_5034.cpp:83:37: error: 'b' was not declared in this scope
             scanf("%d%d%d%d",&a[i],&b[i],&c[i],&d[i]);
                                     ^
0_0_21953191_5034.cpp:83:43: error: 'c' was not declared in this scope
             scanf("%d%d%d%d",&a[i],&b[i],&c[i],&d[i]);
                                           ^
0_0_21953191_5034.cpp:83:49: error: 'd' was not declared in this scope
             scanf("%d%d%d%d",&a[i],&b[i],&c[i],&d[i]);
                                                 ^