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Why this code gives WA for Petersen Graph(codechef)?


The code fails almost every test case I tried. I think the problem is in traverse, in the if statement conditions within the for loops (lines 45 and 51).

if(z[v].s[i]==s[index])

Here, you want index x, such that z[x].p is equal to v. v is not always the correct index, so z[v] is incorrect. Likewise in the other line. Try test cases 'EE' and 'ABCD'.

It would be easiest to reorder the Z array in the order of Z[i].p values, I think.


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