25 lines
592 B
C#
25 lines
592 B
C#
public class Solution {
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private static int Right(List<int> row, int size, int idx) {
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if (idx >= size) {
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return 0;
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}
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return row[idx];
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}
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public int UniquePaths(int m, int n) {
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var bottom = new List<int>(Enumerable.Repeat(1, n));
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for (var y = m - 2; y >= 0; --y) {
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var above = new List<int>(Enumerable.Repeat(0, n));
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for (var x = n - 1; x >= 0; --x) {
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above[x] = Right(above, n, x + 1) + bottom[x];
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}
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bottom = above;
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}
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return bottom[0];
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}
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}
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