@launchmenu/core
Version:
An environment for visual keyboard controlled applets
42 lines • 3.48 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.getLCS = void 0;
/**
* Retrieves the longest subsequence of two sequences
* @param S1 The first sequence
* @param S2 The second sequence
* @param equals A function to determine whether two items in the sequences are equal
* @returns A list of the indexes of sequence 1 and 2 that contained the same item
*/
function getLCS(S1, S2, equals = (a, b) => a == b) {
// Compute the table
let L = [new Array(S2.length + 1).fill(0)];
for (let i = 1; i <= S1.length; i++)
L.push([0]);
for (let i = 1; i <= S1.length; i++)
for (let j = 1; j <= S2.length; j++)
if (equals(S1[i - 1], S2[j - 1]))
L[i][j] = L[i - 1][j - 1] + 1;
else
L[i][j] = Math.max(L[i - 1][j], L[i][j - 1]);
// Retrieve the path
let i = S1.length, j = S2.length;
let out = [];
while (i > 0 && j > 0) {
if (L[i][j] == L[i][j - 1]) {
j--;
}
else if (L[i][j] == L[i - 1][j]) {
i--;
}
else {
i--;
j--;
out.unshift([i, j]);
}
}
// Return the sequence
return out;
}
exports.getLCS = getLCS;
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