feat: add question 75

Author: yinxin630

75.颜色分类.js

@@ -0,0 +1,30 @@
+/*
+ * @lc app=leetcode.cn id=75 lang=javascript
+ *
+ * [75] 颜色分类
+ */
+
+// @lc code=start
+/**
+ * @param {number[]} nums
+ * @return {void} Do not return anything, modify nums in-place instead.
+ */
+var sortColors = function(nums) {
+    const t = new Array(3).fill(0);
+    for (const n of nums) {
+        t[n]++;
+    }
+    let i = 0;
+    let j = 0;
+    while (i < t.length) {
+        if (t[i] === 0) {
+            i++;
+            continue;
+        }
+        nums[j] = i;
+        j++;
+        t[i]--;
+    }
+};
+// @lc code=end
+