UVA 10905 Children's Game
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题意:给n个数字,求由这n个数字组成的最大的数
解题思路:要用string类型,因为数字可能很大超出int型范围。给字符串排序的时候也不能直接比较字符串的长度和大小,举个例子:3、12,组成最大的是312,而不是123,还有9、90,组成最大的是990,而不是909,所以这里的比较方法是a+b>b+a,就像3124>2431
代码:
#include <iostream>#include <algorithm>#include <string>#include <cstring>#include <cmath>#include <cstdio>using namespace std;bool cmp(string s1,string s2){ return s1+s2>s2+s1;}int main(){ int n; while(cin>>n&&n) { string s[55]; for(int i=0;i<n;i++) { cin>>s[i]; } sort(s,s+n,cmp); for(int i=0;i<n;i++) { cout<<s[i]; } cout<<endl; } return 0;}
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