n選m全排列生成

#include<bits/stdc++.h> int a[] = {19,2,38,46,5,64,7,81,92,10,11,12,13,14,15}; int cnt = 0; void f(int m){ std::cout<<"cnt="<<cnt<<"."; for( int i = 0; i < m; ++i) std::cout<<a[i]<<"

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