Added task 2283

src/main/java/g2201_2300/s2283_check_if_number_has_equal_digit_count_and_digit_value/Solution.java

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+package g2201_2300.s2283_check_if_number_has_equal_digit_count_and_digit_value;
+
+// #Easy #Hash_Table #String #Counting #2022_06_17_Time_1_ms_(99.36%)_Space_40.4_MB_(96.46%)
+
+public class Solution {
+ public boolean digitCount(String num) {
+ int[] cnt = new int[11];
+ char[] arr = num.toCharArray();
+ for (char d : arr) {
+ ++cnt[d - '0'];
+ }
+ for (int i = 0; i < arr.length; i++) {
+ if (cnt[i] != arr[i] - '0') {
+ return false;
+ }
+ }
+ return true;
+ }
+}

src/main/java/g2201_2300/s2283_check_if_number_has_equal_digit_count_and_digit_value/readme.md

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+2283\. Check if Number Has Equal Digit Count and Digit Value
+
+Easy
+
+You are given a **0-indexed** string `num` of length `n` consisting of digits.
+
+Return `true` _if for **every** index_ `i` _in the range_ `0 <= i < n`_, the digit_ `i` _occurs_ `num[i]` _times in_ `num`_, otherwise return_ `false`.
+
+**Example 1:**
+
+**Input:** num = "1210"
+
+**Output:** true
+
+**Explanation:** 
+
+num[0] = '1'. The digit 0 occurs once in num. 
+
+num[1] = '2'. The digit 1 occurs twice in num. 
+
+num[2] = '1'. The digit 2 occurs once in num. 
+
+num[3] = '0'. The digit 3 occurs zero times in num. 
+
+The condition holds true for every index in "1210", so return true.
+
+**Example 2:**
+
+**Input:** num = "030"
+
+**Output:** false
+
+**Explanation:** 
+
+num[0] = '0'. The digit 0 should occur zero times, but actually occurs twice in num. 
+
+num[1] = '3'. The digit 1 should occur three times, but actually occurs zero times in num.
+
+num[2] = '0'. The digit 2 occurs zero times in num. 
+
+The indices 0 and 1 both violate the condition, so return false.
+
+**Constraints:**
+
+* `n == num.length`
+* `1 <= n <= 10`
+* `num` consists of digits.

src/test/java/g2201_2300/s2283_check_if_number_has_equal_digit_count_and_digit_value/SolutionTest.java

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+package g2201_2300.s2283_check_if_number_has_equal_digit_count_and_digit_value;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+class SolutionTest {
+ @Test
+ void digitCount() {
+ assertThat(new Solution().digitCount("1210"), equalTo(true));
+ }
+
+ @Test
+ void digitCount2() {
+ assertThat(new Solution().digitCount("030"), equalTo(false));
+ }
+}