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Commit7d8560c

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‎README.md

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@@ -392,6 +392,7 @@ _If you like this project, please leave me a star._ ★
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|883|[Projection Area of 3D Shapes](https://leetcode.com/problems/projection-area-of-3d-shapes/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_883.java) | |Easy|Math
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|881|[Boats to Save People](https://leetcode.com/problems/boats-to-save-people/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_881.java) | |Medium|Two Pointers, Greedy
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|880|[Decoded String at Index](https://leetcode.com/problems/decoded-string-at-index/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_880.java) | |Medium|Stack
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|877|[Stone Game](https://leetcode.com/problems/stone-game/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_877.java) | |Medium| Math, DP, Minimax
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|876|[Middle of the Linked List](https://leetcode.com/problems/middle-of-the-linked-list/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_876.java)||Easy|
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|872|[Leaf-Similar Trees](https://leetcode.com/problems/leaf-similar-trees/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_872.java) | |Easy| DFS, recursion
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|868|[Binary Gap](https://leetcode.com/problems/binary-gap/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_868.java)||Easy|
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packagecom.fishercoder.solutions;
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importjava.util.Arrays;
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publicclass_877 {
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publicstaticclassSolution1 {
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/**
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* credit: https://leetcode.com/problems/stone-game/discuss/154660/Java-This-is-minimax-%2B-dp-(fully-detailed-explanation-%2B-generalization-%2B-easy-understand-code)
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* <p>
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* Suppose the ID for Alex is 1, that for Lee is 0
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* Alex wants to maximize the score to win while Lee wants to minimize the score to win.
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* Each time, each player has two options to pick, we'll use recursion to find the most optimal choice for each of them.
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*/
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publicbooleanstoneGame(int[]piles) {
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intlen =piles.length;
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int[][][]dp =newint[len +1][len +1][2];
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for (int[][]arr :dp) {
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for (int[]num :arr) {
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Arrays.fill(num, -1);
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}
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}
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returnrecursion(dp,0,len -1,1,piles) >0;
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}
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privateintrecursion(int[][][]dp,intleft,intright,intidentifier,int[]piles) {
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if (left >right) {
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return0;
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}
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if (dp[left][right][identifier] != -1) {
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returndp[left][right][identifier];
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}
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intnext =Math.abs(identifier -1);
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if (identifier ==1) {
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dp[left][right][identifier] =Math.max(piles[left] +recursion(dp,left +1,right,next,piles),piles[right] +recursion(dp,left,right -1,next,piles));
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}else {
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dp[left][right][identifier] =Math.min(-piles[left] +recursion(dp,left +1,right,next,piles), -piles[right] +recursion(dp,left,right -1,next,piles));
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}
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returndp[left][right][identifier];
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}
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}
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}
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packagecom.fishercoder;
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importcom.fishercoder.solutions._877;
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importorg.junit.BeforeClass;
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importorg.junit.Test;
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importstaticorg.junit.Assert.assertEquals;
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publicclass_877Test {
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privatestatic_877.Solution1solution1;
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@BeforeClass
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publicstaticvoidsetup() {
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solution1 =new_877.Solution1();
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}
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@Test
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publicvoidtest1() {
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assertEquals(true,solution1.stoneGame(newint[]{5,3,4,5}));
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}
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}

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