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View Code? Open in Web Editor NEWAlgorithms for Competitive Programming: Source code for exercises and algorithms
afcp's Issues
Mistake in code of Listing 6.4: Printing of LCS
The code for Printing the Longest Common Subsequence as given in the book:
void printLCS(int i, int j) {
if (i == 0 || j == 0) {
return;
}
if (C[i][j] == C[i - 1][j - 1] + 1) {
printLCS(i - 1, j - 1);
printf("%d ", X[i - 1]);
} else if (C[i][j] == C[i - 1][j]) {
printLCS(i - 1, j);
} else {
printLCS(i, j - 1);
}
}
But I think the order of the conditionals is wrong as
C[i][j] == C[i - 1][j - 1] + 1
May be satisfied even at i and j's with no common letters hence giving the wrong LCS when using this function with the longer word.
The correct code should be:
void printLCS(int i, int j) {
if (i == 0 || j == 0) {
return;
}
if (C[i][j] == C[i - 1][j]) {
printLCS(i - 1, j);
} else if (C[i][j] == C[i][j-1]){
printLCS(i, j - 1);
}
else {
printLCS(i - 1, j - 1);
printf("%d ", X[i - 1]);
}
}
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