1007. To and Fro

 作业保持感觉。

AC：

#include <iostream>#include <cstring>using namespace std;int main() {int size;while(cin >> size && size != 0) {string tmpWord;cin >> tmpWord;char word[200][size];memset(word, '0', sizeof(word));int count = 0;for(int i = 0; i < 200; i++) {if(tmpWord[count] == '\0') {break;}if(i % 2 ==0) {    for(int j = 0; j < size; j++) {    word[i][j] = tmpWord[count++];    }    }    else {    for(int j = size - 1; j >= 0; j--) {    word[i][j] = tmpWord[count++];    }    }}for(int i = 0; i < size; i++) {    for(int j = 0; j < 200; j++) {    if(word[j][i] != '0') {        cout << word[j][i];        }    }}cout << endl;}return 0;}