Implement next permutation, which rearranges numbers into the
lexicographically next greater permutation of numbers.
If such arrangement is not possible, it must rearrange it as the
lowest possible order (ie, sorted in ascending order).
The replacement must be in-place and use only constant extra memory.
Here are some examples. Inputs are in the left-hand column and its
corresponding outputs are in the right-hand column.
1,2,3 → 1,3,2 3,2,1 → 1,2,3 1,1,5 → 1,5,1
感觉属于那种数学找规律，然后把这个规律用程序表达，写的程序比较简单
找到i满足nums[i]<nums[i+1];
从{i-nums.length-1}中找到比nums[i]大且最小的，其余的按顺序排列
public void nextPermutation(int[] nums) {
if(nums.length<=1) return;
int i=nums.length-2;
for(;i>=0;i--){
if(nums[i]<nums[i+1]) break;
if(i==0){
Arrays.sort(nums);
return;
}
}
int first=nums[i];
int[] ends=Arrays.copyOfRange(nums,i,nums.length);
Arrays.sort(ends);
int j=0;
for(;j<ends.length;j++){
if(ends[j]>first) break;
}
nums[i]=ends[j];
i++;
for(int k=0;k<ends.length;k++){
if(j!=k){
nums[i]=ends[k];
i++;
}
}
}
以上所述就是小编给大家介绍的《[LeetCode]31. Next Permutation》，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对 码农网 的支持！
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The Lambda Calculus, Its Syntax and Semantics . Revised Edition
H.P. Barendregt / North Holland / 1985-11-15 / USD 133.00
The revised edition contains a new chapter which provides an elegant description of the semantics. The various classes of lambda calculus models are described in a uniform manner. Some didactical impr......一起来看看 《The Lambda Calculus, Its Syntax and Semantics . Revised Edition》 这本书的介绍吧!
