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Commit12961cd

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add 881
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‎README.md

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@@ -362,6 +362,7 @@ _If you like this project, please leave me a star._ ★
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|885|[Spiral Matrix III](https://leetcode.com/problems/spiral-matrix-iii/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_885.java)|[:tv:](https://www.youtube.com/watch?v=0qep3f9cqVs)|Medium|
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|884|[Uncommon Words from Two Sentences](https://leetcode.com/problems/uncommon-words-from-two-sentences/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_884.java)||Easy|
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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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|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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packagecom.fishercoder.solutions;
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importjava.util.ArrayList;
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importjava.util.List;
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importjava.util.TreeMap;
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publicclass_881 {
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publicstaticclassSolution1 {
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publicintnumRescueBoats(int[]people,intlimit) {
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TreeMap<Integer,Integer>map =newTreeMap<>();
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for (intw :people) {
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map.put(w,map.getOrDefault(w,0) +1);
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}
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intboats =0;
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List<Integer>uniqWeights =newArrayList(map.keySet());
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intleft =0;
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intright =uniqWeights.size() -1;
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while (left <right) {
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intheavierWeight =uniqWeights.get(right);
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intlighterWeight =uniqWeights.get(left);
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if (heavierWeight +lighterWeight <=limit) {
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intpairs =Math.min(map.get(heavierWeight),map.get(lighterWeight));
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boats +=pairs;
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if (map.get(heavierWeight) ==pairs &&map.get(lighterWeight) ==pairs) {
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map.remove(heavierWeight);
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map.remove(lighterWeight);
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left++;
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right--;
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}elseif (map.get(heavierWeight) ==pairs) {
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map.remove(heavierWeight);
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map.put(lighterWeight,map.get(lighterWeight) -pairs);
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right--;
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}else {
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map.remove(lighterWeight);
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map.put(heavierWeight,map.get(heavierWeight) -pairs);
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left++;
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}
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}else {
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boats +=map.get(heavierWeight);
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map.remove(heavierWeight);
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right--;
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}
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}
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if (!map.isEmpty()) {
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intweight =uniqWeights.get(left);
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intremainingPeople =map.get(weight);
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if (remainingPeople ==1) {
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boats++;
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}else {
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if (weight *2 <=limit) {
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boats += (remainingPeople /2 + ((remainingPeople %2 ==0) ?0 :1));
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}else {
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boats +=remainingPeople;
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}
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}
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}
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returnboats;
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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._881;
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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_881Test {
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privatestatic_881.Solution1solution1;
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@BeforeClass
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publicstaticvoidsetup() {
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solution1 =new_881.Solution1();
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}
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@Test
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publicvoidtest1() {
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assertEquals(1,solution1.numRescueBoats(newint[]{1,2},3));
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}
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@Test
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publicvoidtest2() {
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assertEquals(3,solution1.numRescueBoats(newint[]{3,2,2,1},3));
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}
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@Test
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publicvoidtest3() {
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assertEquals(4,solution1.numRescueBoats(newint[]{3,5,3,4},5));
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}
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@Test
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publicvoidtest4() {
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assertEquals(2,solution1.numRescueBoats(newint[]{2,4},5));
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}
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@Test
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publicvoidtest5() {
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assertEquals(29,solution1.numRescueBoats(newint[]{4,9,3,1,1,7,6,10,10,10,1,8,8,7,8,10,7,4,6,3,6,1,2,4,8,8,4,7,1,2,10,3,4,6,3,5,3,1,2,6,1,5,4,5,1,10,5,9,10,4},10));
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}
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}

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