[問題] lucky number or not

看板C_and_CPP (C/C++)作者heymei0421 (heymei)時間14年前 (2011/12/06 18:28)推噓1(1推 0噓 15→)

留言16則, 7人參與討論串1/1

開發平台(Platform): (Ex: VC++, GCC, Linux, ...) C 問題(Question)： Petya loves lucky numbers. We all know that lucky numbers are the positive integers whose decimal representations contain only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not. Unfortunately, not all numbers are lucky. Petya calls a number nearly lucky if the number of lucky digits in it is a lucky number. He wonders whether number n is a nearly lucky number. ---------------------------------------------------------------------------- 我自己的翻譯是只要一串數字裡面若全部是4與7的組合則 lucky number 否則不是，但學長說我誤會題意..我看了老半天..都不知道自己哪裡誤會題意.. 餵入的資料(Input)： The only line contains an integer n (1≦n≦10^18) 錯誤結果(Wrong Output)：第4筆測試資料沒過= = 程式碼(Code)：(請善用置底文網頁, 記得排版) **由於很短，所以小弟就不po在codepad了** #include<stdio.h> #include<stdlib.h> #include<math.h> int main() { long long int n=0,k=0,temp=0,t=10,i; scanf("%I64d",&n); temp = n; do{ temp = temp/10; k++; }while(temp!=0); for(i=0;i<k;i++) { if((n%t)/(t/10)!=4 && (n%t)/(t/10)!=7) { printf("NO"); return 0; } t=t*10; } printf("YES"); return 0; } 補充說明(Supplement)： Sample test (1) input:40047 output:No (2) input:7747774 output:YES (3):10000000000000000 output:No Note: In the first sample there are 3 lucky digits (first one and last two), so the answer is "NO". In the second sample there are 7 lucky digits, 7 is lucky number, so the answer is "YES". In the third sample there are no lucky digits, so the answer is "NO". -------------------------------------------------------------------------- 我到底題意錯在哪~_~麻煩各位大大惹 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 111.251.244.130

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ilway25

12/06 18:34, , 1^F

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12/06 18:51, , 2^F

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