update 40 & refine 46

Author: hijiangtao

src/combination-sum-ii/res.js

@@ -17,7 +17,11 @@ var combinationSum2 = function(candidates, target) {
 calCombs(candis.slice(1), [...resArr, ele], targ-ele);
 }
 
-calCombs(candis.slice(1), [...resArr], targ);
+let sliceIndex = 0;
+while (sliceIndex < candis.length && candis[0] === candis[sliceIndex]) {
+sliceIndex++;
+}
+calCombs(candis.slice(sliceIndex), [...resArr], targ);
 }
 
 calCombs(candidates, [], target);

src/permutations/res.js

@@ -45,3 +45,27 @@ let subpermute = function(base, nums) {
 
 return res;
 };
+
+
+/**
+* @param {number[]} nums
+* @return {number[][]}
+*/
+var permute = function(nums) {
+const len = nums.length;
+if (!len) return [];
+const res = [];
+
+const enmurate = (preArr, candidates) => {
+if (candidates.length === 1) return res.push([...preArr, ...candidates]);
+
+for (let i = 0; i < candidates.length; i++) {
+const temp = candidates.slice();
+temp.splice(i, 1);
+enmurate([...preArr, candidates[i]], temp);
+}
+}
+
+enmurate([], nums.slice());
+return res;
+};