uva - 10905 - Children's Game(贪心,qsort排序)
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题意:输入几个数字,这几个数字按照不同顺序可以组成一个大数,输出这个大数。
方法:刚开始按照字典序排列果断跪了,90和9这样的会出错,应该9在前,字典序9在后,看了别人的博客知道了一种方法,比较909和990,return回去就行,详见代码。
参考:http://blog.csdn.net/sambrown123/article/details/9039061
#include <iostream>#include <iomanip>#include <string>#include <cstring>#include <cstdio>#include <queue>#include <stack>#include <algorithm>#include <cmath>using namespace std;#define MAX 100+2int cmp(const void *a, const void *b){char s1[500], s2[500];if (strlen((char * )a) == strlen((char *)b))return strcmp((char *)b, (char *)a);else{strcpy(s1, (char *)a);strcat(s1, (char *)b);strcpy(s2, (char *)b);strcat(s2, (char *)a);return strcmp(s2, s1);}}int main(){#ifdef Localfreopen("a.in", "r", stdin);freopen("a.out", "w", stdout);#endifint i = 0, n = 0;char num[MAX][MAX];while (cin >> n && n){for (i = 0; i < n; i++)cin >> num[i];qsort(num, n, sizeof(num[0]), cmp);for (i = 0; i < n; i++)cout << num[i];cout << endl;}}
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