20240808 Finished
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@ -198,3 +198,4 @@ mod p70_climbing_stairs;
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mod p198_house_robber;
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mod p139_word_break;
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mod p300_longest_increasing_subsequence;
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mod p120_triangle;
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42
src/problem/p120_triangle.rs
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42
src/problem/p120_triangle.rs
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@ -0,0 +1,42 @@
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/**
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* [120] Triangle
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*/
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pub struct Solution {}
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// submission codes start here
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impl Solution {
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pub fn minimum_total(triangle: Vec<Vec<i32>>) -> i32 {
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let n = triangle.len();
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let mut dp = vec![i32::MAX; n];
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dp[0] = 0;
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for i in 0..n {
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let mut next_dp = vec![i32::MAX; n];
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for j in 0..=i {
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if j == 0 {
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next_dp[j] = triangle[i][j] + dp[j];
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} else {
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next_dp[j] = triangle[i][j] + dp[j - 1].min(dp[j]);
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}
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}
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dp = next_dp;
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}
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*dp.iter().min().unwrap()
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}
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}
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// submission codes end
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_120() {
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assert_eq!(11, Solution::minimum_total(vec![vec![2], vec![3, 4], vec![6, 5, 7], vec![4, 1, 8, 3]]));
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}
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}
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