两个函数都在#include <algorithm>里 顾名思义,next_permutation用来求下一个排列,prev_permutation用来求上一个排列. 当前的排列不满足函数能够继续执行的条件的时候,返回false,否则返回true 比如数组中已经是1,2,3,4,5了,就不能用prev_permutation了 #include <bits/stdc++.h> using namespace std; int main () { int data[5]={1,2,3…
P4163 [SCOI2007]排列 注意要排序: next_permutation prev_permutation #include<cstdio> #include<cstring> #include<algorithm> using namespace std; ; typedef long long ll; int T,n,d; int a[maxn]; char s[maxn]; ll ans; int main() { scanf("%d&quo…
1.碰到next_permutation(permutation:序列的意思) 今天在TC上碰到一道简单题(SRM531 - Division Two - Level One),是求给定数组不按升序排列的最小字典序列(Sequence of numbers A is lexicographically smaller than B if A contains a smaller number on the first position on which they differ). 解法很简单,就…