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Commit777f9dc

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add 1541
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‎README.md

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@@ -8,6 +8,7 @@ _If you like this project, please leave me a star._ ★
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| # | Title | Solutions | Video | Difficulty | Tag
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|-----|----------------|---------------|--------|-------------|-------------
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|1541|[Minimum Insertions to Balance a Parentheses String](https://leetcode.com/problems/minimum-insertions-to-balance-a-parentheses-string/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1541.java)||Medium|String, Stack|
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|1539|[Kth Missing Positive Number](https://leetcode.com/problems/kth-missing-positive-number/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1539.java)||Easy|Array, HashTable|
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|1535|[Find the Winner of an Array Game](https://leetcode.com/problems/find-the-winner-of-an-array-game/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1535.java)|[:tv:](https://youtu.be/v6On1TQfMTU)|Medium|Array|
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|1534|[Count Good Triplets](https://leetcode.com/problems/count-good-triplets/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1534.java)||Easy|Array|
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packagecom.fishercoder.solutions;
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importjava.util.Stack;
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publicclass_1541 {
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publicstaticclassSolution1 {
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publicintminInsertions(Strings) {
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Stack<Character>stack =newStack<>();
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intinsertionsNeeded =0;
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for (inti =0;i <s.length();i++) {
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charc =s.charAt(i);
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if (c =='(') {
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if (stack.isEmpty()) {
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stack.add(c);
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}else {
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if (stack.peek() ==')') {
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//in this case, we need to add one more ')' to get two consecutive right paren, then we could pop the one ')' and one '(' off the stack
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insertionsNeeded++;
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stack.pop();
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stack.pop();
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stack.add(c);
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}else {
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stack.add(c);
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}
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}
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}elseif (c ==')') {
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if (stack.isEmpty()) {
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//in this case, we need to add one '(' before we add this ')' onto this stack
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insertionsNeeded++;
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stack.add('(');
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stack.add(c);
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}else {
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if (stack.peek() ==')') {
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//in this case, we could pop the one ')' and one '(' off the stack
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stack.pop();
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stack.pop();
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}else {
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stack.add(c);
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}
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}
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}
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}
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if (stack.isEmpty()) {
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returninsertionsNeeded;
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}else {
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while (!stack.isEmpty()) {
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charpop =stack.pop();
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if (pop =='(') {
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insertionsNeeded +=2;
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}else {
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insertionsNeeded++;
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stack.pop();
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}
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}
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returninsertionsNeeded;
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}
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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._1541;
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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_1541Test {
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privatestatic_1541.Solution1solution1;
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@BeforeClass
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publicstaticvoidsetup() {
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solution1 =new_1541.Solution1();
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}
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@Test
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publicvoidtest1() {
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assertEquals(1,solution1.minInsertions("(()))"));
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}
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@Test
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publicvoidtest2() {
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assertEquals(0,solution1.minInsertions("())"));
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}
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@Test
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publicvoidtest3() {
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assertEquals(3,solution1.minInsertions("))())("));
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}
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@Test
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publicvoidtest4() {
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assertEquals(12,solution1.minInsertions("(((((("));
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}
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@Test
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publicvoidtest5() {
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assertEquals(5,solution1.minInsertions(")))))))"));
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}
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@Test
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publicvoidtest6() {
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assertEquals(4,solution1.minInsertions("(()))(()))()())))"));
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}
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}

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