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题目大意:
就是说给你一个abcde/fghij = n的表达式,给你一个n,让你求出有多少个这样的式子。
解题思路:
最为简单的枚举了,要注意到我们只需要枚举出来fghij就可以了,因为abcde=fghij*n,这样的话,时间复杂度由10!就
降低到了5!,在枚举结束后,我们只需要判断0-9这些数字是否都出现了且仅出现一次即可。然后对于超过5位的数字,我们
直接break掉。
这道题的输出一定要注意那个前导0,,一开始忘记了,WA了两次,然后果断用setw(5)和setfill(‘0‘)给搞定了。
这条语句也是可以搞定的 printf("%d / %05d = %d\n",tt,t,n);
代码:
# include<cstdio> # include<iostream> # include<algorithm> # include<functional> # include<cstring> # include<string> # include<cstdlib> # include<iomanip> # include<numeric> # include<cctype> # include<cmath> # include<ctime> # include<queue> # include<stack> # include<list> # include<set> # include<map> using namespace std; const double PI=4.0*atan(1.0); typedef long long LL; typedef unsigned long long ULL; # define inf 999999999 int n; int num[10]; int check ( int x,int y ) { memset(num,0,sizeof(num)); int a = x; int b = y; for ( int i = 0;i < 5;i++ ) { num[a%10]++; num[b%10]++; a/=10; b/=10; } for ( int i = 0;i < 10;i++ ) { if ( num[i]!=1 ) return 0; } return 1; } int main(void) { int icase = 1; while ( cin>>n ) { if ( n==0 ) break; if ( icase > 1 ) cout<<endl; int flag = 0; for ( int t = 1234;;t++ ) { int tt = t*n; if ( tt >= 100000 ) break; if ( check(tt,t) ) { flag = 1; printf("%d / %05d = %d\n",tt,t,n); //printf("%d / %d = %d\n",tt,t,n); } } if ( !flag ) { printf("There are no solutions for %d.\n",n); } icase++; } return 0; }
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原文地址:http://www.cnblogs.com/wikioibai/p/4391353.html