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给出1到n的n个数，返回k个数组合 输入n=4,k=2 输出[1,2],[1,3],[1,4],[2,3],[2,4],[3,4] #include <iostream> #include<algorithm> #include<string> #include<vector> #include<math.h> using namespace std; vector<int> s; vector< vector<i

#include <iostream> #include<string> #include<vector> using namespace std; vector<string> result;//定义全局变量，以便每个函数使用 string s; string lettermap[10]={"","","abc","def","ghi","jkl","mno","pqrs","tuv","wxyz"}; void back(string &di.