View Compilation Error

0_0_20533993_16428.cpp: In function 'bool spfa(int)':
0_0_20533993_16428.cpp:28:3: error: 'd' was not declared in this scope
   d[i]=0;
   ^
0_0_20533993_16428.cpp:31:2: error: 'd' was not declared in this scope
  d[s]=1.0;
  ^