forward_list復制奇數刪除偶數

Practice9.31

#include <iostream> #include <queue> #include <string> #include <vector> #include <algorithm> #include <list> #include <iterator> #include <cmath> #include <cstring> #include <forward_list> using namespace std;void flst_print(forward_list<int> & flst) {for(auto i : flst) {cout << i << " ";}cout << endl; }int main() {forward_list<int> flst = {7, 8, 9, 10, 11, 12};auto it = flst.begin();auto pre_it = flst.before_begin();while(it != flst.end()) {if(*it % 2) {it = flst.insert_after(it, *it);++it;++pre_it;++pre_it;}else {it = flst.erase_after(pre_it);}} flst_print(flst);return 0; } wanglangdeMacBook-Pro:Documents wanglang$ vim test.cpp wanglangdeMacBook-Pro:Documents wanglang$ vim test.cpp wanglangdeMacBook-Pro:Documents wanglang$ vim test.cpp wanglangdeMacBook-Pro:Documents wanglang$ cat test.cpp #include <iostream> #include <queue> #include <string> #include <vector> #include <algorithm> #include <list> #include <iterator> #include <cmath> #include <cstring> #include <forward_list> using namespace std;void flst_print(forward_list<int> & flst) {for(auto i : flst) {cout << i << " ";}cout << endl; }int main() {forward_list<int> flst = {7, 8, 9, 10, 11, 12};auto it = flst.begin();auto pre_it = flst.before_begin();cout << "Original forward_list: " << endl;flst_print(flst);while(it != flst.end()) {if(*it % 2) {it = flst.insert_after(it, *it);++it;++pre_it;++pre_it;}else {it = flst.erase_after(pre_it);}} cout << "Copy odd number and delete even number: " << endl;flst_print(flst);return 0; }

Output

Original forward_list: 7 8 9 10 11 12 Copy odd number and delete even number: 7 7 9 9 11 11

The word ‘impossible’ is not in my dictionary.

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