Your Ride Is Here
It is a well-known fact that behind every good comet is a UFO. These UFOsoften come to collect loyal supporters from here on Earth. Unfortunately, theyonly have room to pick up one group of followers on each trip. They do,however, let the groups know ahead of time which will be picked up for eachcomet by a clever scheme: they pick a name for the comet which, along with thename of the group, can be used to determine if it is a particular group's turn togo (who do you think names the comets?). The details of the matching scheme aregiven below; your job is to write a program which takes the names of a groupand a comet and then determines whether the group should go with the UFO behindthat comet.
Both the name of the group and the name of the comet are converted into anumber in the following manner: the final number is just the product of all theletters in the name, where "A" is 1 and "Z" is 26. Forinstance, the group "USACO" would be 21 * 19 * 1 * 3 * 15 = 17955. Ifthe group's number mod 47 is the same as the comet's number mod 47, then youneed to tell the group to get ready! (Remember that "a mod b" is theremainder left over after dividing a by b; 34 mod 10 is 4.)
Write a program which reads in the name of the comet and the name of thegroup and figures out whether according to the above scheme the names are amatch, printing "GO" if they match and "STAY" if not. Thenames of the groups and the comets will be a string of capital letters with nospaces or punctuation, up to 6 characters long.
Examples:
|
Input |
Output |
|
COMETQ HVNGAT |
GO |
|
ABSTAR USACO |
STAY |
PROGRAM NAME: ride
This means that you fill in your header with:
PROG: ride
WARNING: You must have 'ride' in this field or the wrong test data (orno test data) will be used.
INPUT FORMAT
|
Line 1: |
An upper case character string of length 1..6 that is the name of the comet. |
|
Line 2: |
An upper case character string of length 1..6 that is the name of the group. |
NOTE: The input file has a newline atthe end of each line but does not have a "return". Sometimes,programmers code for the Windows paradigm of "return" followed by"newline"; don't do that! Use simple input routines like"readln" (for Pascal) and, for C/C++, "fscanf" and"fid>>string".
NOTE 2: Because of the extracharacters, be sure to leave enough room for a 'newline' (also notated as '\n')and an end of string character ('\0') if your language uses it (as C and C++do). This means you need eight characters of room instead of six.
SAMPLE INPUT (file ride.in)
COMETQ
HVNGAT
OUTPUT FORMAT
A single line containing either the word "GO"or the word "STAY".
SAMPLE OUTPUT (file ride.out)
GO
OUTPUT EXPLANATION
Converting the letters to numbers:
|
C |
O |
M |
E |
T |
Q |
|
|
3 |
15 |
13 |
5 |
20 |
17 |
|
|
|
|
|
|
|
|
|
|
H |
V |
N |
G |
A |
T |
|
|
8 |
22 |
14 |
7 |
1 |
20 |
|
then calculate the product mod 47:
3 * 15 * 13 * 5 * 20 * 17 = 994500 mod 47 = 27
8 * 22 * 14 * 7 * 1 * 20 = 344960 mod 47 = 27
Because both products evaluate to 27 (when modded by 47), the mission is'GO'.
应该是一道类似于A+B的题目吧,用于熟悉oj的,不解释
/*
ID:su1q2d21
LANG:C++
TASK:ride
*/
#include<iostream>
#include<cstring>
#include<cstdio>
#define mod 47
#define maxn 10
using namespace std;
char comet[maxn];
char group[maxn];
int main()
{
freopen("ride.in","r",stdin);
freopen("ride.out","w",stdout);
int lc,lg;
int proc=1,prog=1;
int i;
scanf("%s",comet);
scanf("%s",group);
lc=strlen(comet);
lg=strlen(group);
for(i=0;i<lc;i++){
proc*=(comet[i]-'A'+1);
proc%=mod;
}
for(i=0;i<lg;i++){
prog*=(group[i]-'A'+1);
prog%=mod;
}
if(proc==prog) printf("GO\n");
else printf("STAY\n");
return 0;
}
本文深入探讨了一个基于字母数值转换的算法,旨在解决一个独特的问题:如何通过彗星和地球支持者团体的名字来判断是否应该派遣UFO进行星际旅行。通过将名字转化为数字并进行模运算,读者可以了解如何编写程序来实现这一匹配过程。
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