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Commit 4665ffa

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add 3258
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  • paginated_contents/algorithms/4th_thousand
  • src

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‎paginated_contents/algorithms/4th_thousand/README.md‎

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| # | Title | Solutions | Video | Difficulty | Tag
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|------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------|------------|----------------------------------------------------------------------
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| 3258 | [Count Substrings That Satisfy K-Constraint I](https://leetcode.com/problems/count-substrings-that-satisfy-k-constraint-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3258.java) | | Easy |
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| 3254 | [Find the Power of K-Size Subarrays I](https://leetcode.com/problems/find-the-power-of-k-size-subarrays-i/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3254.java) | | Easy |
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| 3249 | [Count the Number of Good Nodes](https://leetcode.com/problems/count-the-number-of-good-nodes/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3249.java) | | Medium |
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| 3248 | [Snake in Matrix](https://leetcode.com/problems/snake-in-matrix/) | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3248.java) | | Easy |
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package com.fishercoder.solutions.fourththousand;
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public class _3258 {
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public static class Solution1 {
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public int countKConstraintSubstrings(String s, int k) {
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int ans = 0;
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for (int i = 0; i < s.length(); i++) {
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for (int j = i + 1; j <= s.length(); j++) {
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String candidate = s.substring(i, j);
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if (meetConstraints(candidate, k)) {
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ans++;
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}
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}
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}
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return ans;
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}
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private boolean meetConstraints(String candidate, int k) {
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int ones = 0;
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int zeroes = 0;
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for (char c : candidate.toCharArray()) {
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if (c == '0') {
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zeroes++;
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} else {
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ones++;
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}
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}
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return ones <= k || zeroes <= k;
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}
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}
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}
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package com.fishercoder.fourththousand;
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import com.fishercoder.solutions.fourththousand._3258;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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public class _3258Test {
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private _3258.Solution1 solution1;
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@BeforeEach
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public void setup() {
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solution1 = new _3258.Solution1();
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}
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@Test
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public void test1() {
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assertEquals(12, solution1.countKConstraintSubstrings("10101", 1));
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}
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@Test
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public void test2() {
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assertEquals(25, solution1.countKConstraintSubstrings("1010101", 2));
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}
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}

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