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Add 1690#140

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46 changes: 46 additions & 0 deletionssrc/main/java/com/fishercoder/solutions/_1690.java
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package com.fishercoder.solutions;

public class _1690 {
public static class Solution1 {

int[] stonesRef;

int[] prepareSums;

int[][] maxDiffScoureBetweenTowPlayerWhenPlayInPosItoJ = new int[1005][1005];

public int stoneGameVII(int[] stones) {
this.stonesRef = stones;
int totalStonesNumber = stones.length;
this.prepareSums = new int[totalStonesNumber + 1];
for (int i = 1; i <= totalStonesNumber; i++) {
this.prepareSums[i] = this.prepareSums[i - 1] + stones[i - 1];
}
for (int len = 1; len <= totalStonesNumber; len++) {
for (int i = 1; i + len - 1 <= totalStonesNumber; i++) {
int j = i + len - 1;
this.setMaxDiffScoureBetweenTowPlayerWhenPlayInPosItoJ(i, j);
}
}
return maxDiffScoureBetweenTowPlayerWhenPlayInPosItoJ[1][totalStonesNumber];
}

private void setMaxDiffScoureBetweenTowPlayerWhenPlayInPosItoJ(int i, int j) {
if (j - i == 0) {
maxDiffScoureBetweenTowPlayerWhenPlayInPosItoJ[i][j] = 0;
} else if (j - i == 1) {
maxDiffScoureBetweenTowPlayerWhenPlayInPosItoJ[i][j] = Math.max(stonesRef[i - 1], stonesRef[j - 1]);
} else {
maxDiffScoureBetweenTowPlayerWhenPlayInPosItoJ[i][j] = Math.max(
this.sumOfTheStonesValueInPosIToJ(i + 1, j)
- maxDiffScoureBetweenTowPlayerWhenPlayInPosItoJ[i + 1][j],
this.sumOfTheStonesValueInPosIToJ(i, j - 1)
- maxDiffScoureBetweenTowPlayerWhenPlayInPosItoJ[i][j - 1]);
}
}

private int sumOfTheStonesValueInPosIToJ(int i, int j) {
return this.prepareSums[j] - this.prepareSums[i - 1];
}
}
}
22 changes: 22 additions & 0 deletionssrc/test/java/com/fishercoder/_1690Test.java
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package com.fishercoder;

import com.fishercoder.solutions._1690;
import org.junit.BeforeClass;
import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class _1690Test {
private static _1690.Solution1 solution1;

@BeforeClass
public static void setup() {
solution1 = new _1690.Solution1();
}

@Test
public void test1() {
assertEquals(6, solution1.stoneGameVII(new int[]{5,3,1,4,2}));
}

}
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