POJ3307+找规律

时间:2021-07-12 10:28:52
/*
题意:求第N个productivity property数是谁。
(productivity property数:就是这个数可以由另外的数的各个位上的乘积得到。)
*/
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<algorithm>
#include<iostream>
#include<queue>
#include<map>
#include<stack>
#include<set>
#include<math.h>
using namespace std;
typedef long long int64;
//typedef __int64 int64;
typedef pair<int64,int64> PII;
#define MP(a,b) make_pair((a),(b))
const int maxn = 10000005;
const int64 M = 1e18;
const int inf = 0x7fffffff;
const double pi=acos(-1.0);
const double eps = 1e-8; int64 ans[ maxn+5 ]; int64 fmin( int64 a,int64 b,int64 c,int64 d ){
if( a>b ) a = b;
if( a>c ) a = c;
if( a>d ) a = d;
return a;
} void init(){
//memset( ans,0,sizeof( ans ) );
ans[ 1 ] = 1;
int cnt2 = 1,cnt3 = 1,cnt5 = 1,cnt7 = 1;
for( int i=2;i<maxn;i++ ){
ans[i] = fmin( ans[cnt2]*2,ans[cnt3]*3,ans[cnt5]*5,ans[cnt7]*7 );
if( ans[i]==ans[cnt2]*2 ) cnt2 ++;
if( ans[i]==ans[cnt3]*3 ) cnt3 ++;
if( ans[i]==ans[cnt5]*5 ) cnt5 ++;
if( ans[i]==ans[cnt7]*7 ) cnt7 ++;
if( ans[i]>M ) break;
}
} int main(){
init();
int T;
scanf("%d",&T);
while( T-- ){
int n;
scanf("%d",&n);
printf("%lld\n",ans[n]);
}
return 0;
}