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Commit 4926b74

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Added tasks 150-152.
1 parent caa684d commit 4926b74

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6 files changed

+126
-0
lines changed

6 files changed

+126
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lines changed
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package g0101_0200.s0150_evaluate_reverse_polish_notation;
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import java.util.Stack;
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@SuppressWarnings("java:S1149")
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public class Solution {
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public int evalRPN(String[] tokens) {
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Stack<Integer> st = new Stack<>();
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for (int i = 0; i < tokens.length; i++) {
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if (!Character.isDigit(tokens[i].charAt(tokens[i].length() - 1))) {
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st.push(eval(st.pop(), st.pop(), tokens[i]));
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} else {
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st.push(Integer.parseInt(tokens[i]));
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}
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}
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return st.pop();
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}
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private int eval(int second, int first, String operator) {
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switch (operator) {
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case "+":
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return first + second;
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case "-":
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return first - second;
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case "*":
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return first * second;
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default:
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return first / second;
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}
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}
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}
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package g0101_0200.s0151_reverse_words_in_a_string;
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public class Solution {
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public String reverseWords(String s) {
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StringBuilder sb = new StringBuilder();
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int i = s.length() - 1;
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while (i >= 0) {
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if (s.charAt(i) == ' ') {
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i--;
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continue;
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}
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int start = s.lastIndexOf(' ', i);
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sb.append(' ');
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sb.append(s.substring(start + 1, i + 1));
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i = start - 1;
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}
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if (sb.length() > 0) {
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sb.deleteCharAt(0);
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}
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return sb.toString();
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}
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}
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package g0101_0200.s0152_maximum_product_subarray;
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public class Solution {
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public int maxProduct(int[] arr) {
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int ans = Integer.MIN_VALUE;
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int cprod = 1;
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for (int i = 0; i < arr.length; i++) {
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cprod = cprod * arr[i];
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ans = Math.max(ans, cprod);
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if (cprod == 0) {
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cprod = 1;
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}
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}
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cprod = 1;
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for (int i = arr.length - 1; i >= 0; i--) {
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cprod = cprod * arr[i];
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ans = Math.max(ans, cprod);
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if (cprod == 0) {
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cprod = 1;
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}
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}
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return ans;
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}
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}
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package g0101_0200.s0150_evaluate_reverse_polish_notation;
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import static org.hamcrest.CoreMatchers.equalTo;
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import static org.hamcrest.MatcherAssert.assertThat;
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import org.junit.Test;
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public class SolutionTest {
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@Test
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public void evalRPN() {
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assertThat(new Solution().evalRPN(new String[] {"2", "1", "+", "3", "*"}), equalTo(9));
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assertThat(new Solution().evalRPN(new String[] {"4", "13", "5", "/", "+"}), equalTo(6));
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assertThat(
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new Solution()
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.evalRPN(
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new String[] {
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"10", "6", "9", "3", "+", "-11", "*", "/", "*", "17", "+", "5",
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"+"
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}),
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equalTo(22));
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}
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}
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package g0101_0200.s0151_reverse_words_in_a_string;
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import static org.hamcrest.CoreMatchers.equalTo;
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import static org.hamcrest.MatcherAssert.assertThat;
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import org.junit.Test;
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public class SolutionTest {
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@Test
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public void reverseWords() {
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assertThat(new Solution().reverseWords("the sky is blue"), equalTo("blue is sky the"));
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}
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}
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package g0101_0200.s0152_maximum_product_subarray;
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import static org.hamcrest.CoreMatchers.equalTo;
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import static org.hamcrest.MatcherAssert.assertThat;
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import org.junit.Test;
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public class SolutionTest {
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@Test
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public void maxProduct() {
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assertThat(new Solution().maxProduct(new int[] {2, 3, -2, 4}), equalTo(6));
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}
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}

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