题目一: public class testClockwiseOutput { //顺时针打印一个矩阵 @Test public void test(){ int[][] num = new int[100][100]; int n = 4; int count =1; for(int i=0;i<n;i++){ for(int j =0;j<n;j++){ num[i][j]=count++; } } output(num,0,n-1); } public void output(int[]
Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example,[1,1,2] have the following unique permutations:[1,1,2], [1,2,1], and [2,1,1]. 思路:递归地将每个元素与第一个元素进行交换.有一个额外的空间Set<Integer> duplicated,如果某
1023 - Discovering Permutations PDF (English) Statistics ForumTime Limit: 0.5 second(s) Memory Limit: 32 MBIn this problem you have to find the permutations using the first N English capital letters. Since there can be many permutations, you have to