View Compilation Error

0_0_33737554_20106.cpp: In member function 'void KuhnMunkres::bfs(int)':
0_0_33737554_20106.cpp:29:24: error: 'd' was not declared in this scope
                     if(d=hl[i]+hr[j]-a[i][j],!vl[i]&&slk[i]>=d)
                        ^
0_0_33737554_20106.cpp:32:13: error: 'd' was not declared in this scope
             d=INF;
             ^