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C/C++ code

#include <iostream>#include <vector>#include <algorithm>#include <iterator>using namespace std;template <class ForwardIterator, class T>void iota_n(ForwardIterator first, int n,T value){    for (int i=0;i<n;i++)        *first++=value++;}void main(int argc,char* argv[]){    int n=2;    vector<int> v;    v.reserve(3);    iota_n(v.begin(),n,100);    random_shuffle(v.begin(),v.end());    copy(v.begin(),v.end(),ostream_iterator<int>(cout,"\n"));}

应该随机输出1到100的整数，结果却什么也没有输出，求真相。

[解决办法]

C/C++ code

#include <iostream>#include <vector>#include <algorithm>#include <iterator>using namespace std;template <class ForwardIterator, class T>void iota_n(ForwardIterator first, int n,T value){    for (int i=0;i<n;i++)        *first++=value++;}void main(int argc,char* argv[]){    int n=2;    vector<int> v(3);        iota_n(v.begin(),n,100);    random_shuffle(v.begin(),v.end());    copy(v.begin(),v.end(),ostream_iterator<int>(cout,"\n"));}