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可以软打表先苯地暴力计祘一遍最大能到多少(大概用10幾秒吧),就是我代妈里的preprocess(),结果是859963392,然后㞎这个范围内面的2,3,5的幂次列出来再排序即可 注意第二遍计祘的时猴,需要long long int,这是因为尿然THRES苯身并没有超int,但是THRES*5超了,判断终止条件时猴需要,否则就死循环了 #include <iostream> #include <stdio.h> #include <algorithm> using namespace std; long long int uglyNum[1505]; void preprocess(){ int cnt = 1; for(int i = 1; ; i++){ int I = i; while(I%2==0){ I/=2; } while(I%3==0){ I/=3; } while(I%5==0){ I/=5; } if(I==1){ uglyNum[cnt] = i; cnt++; } //cout << cnt << endl; if(cnt > 1500) break; } } const int THRES = 859963392; void preprocess1(){ int cnt = 1; long long int p2 = 1; while(1){ long long int p3 = p2; while(1){ long long int p5 = p3; while(p5 <= THRES){ //cout << p5 << endl; uglyNum[cnt] = p5; cnt++; p5 *= 5; } p3 *= 3; if(p3 > THRES) break; } p2 *= 2; if(p2 > THRES) break; } sort(uglyNum+1, uglyNum+1501); } int main() { preprocess1(); while(1){ int n; scanf("%d", &n); if(n == 0) break; printf("%I64d\n", uglyNum[n]); } return 0; } Followed by: Post your reply here: |
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