USACO 1.1 Your ride is here 解题报告

Your Ride Is Here

It is a well-known fact that behind every good comet is a UFO. These UFOs often come to collect loyal supporters from here on Earth. Unfortunately, they only 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 each comet by a clever scheme: they pick a name for the comet which, along with the name of the group, can be used to determine if it is a particular group's turn to go (who do you think names the comets?). The details of the matching scheme are given below; your job is to write a program which takes the names of a group and a comet and then determines whether the group should go with the UFO behind that comet.

Both the name of the group and the name of the comet are converted into a number in the following manner: the final number is just the product of all the letters in the name, where "A" is 1 and "Z" is 26. For instance, the group "USACO" would be 21 * 19 * 1 * 3 * 15 = 17955. If the group's number mod 47 is the same as the comet's number mod 47, then you need to tell the group to get ready! (Remember that "a mod b" is the remainder 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 the group and figures out whether according to the above scheme the names are a match, printing "GO" if they match and "STAY" if not. The names of the groups and the comets will be a string of capital letters with no spaces 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

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 at the 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".

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

总结：

	该题为入门级题目，但是由于对usaco做题方式不怎么了解，导致多次提交失败，该系统要求附加个人信息以及题目名称，使用语言等，在输入与输出也与常规不同，需要用到文件的读入读出，即fstream 流文件，实际上也就是多那么几句话的问题，同样输入输出也要用fin与fout。

源代码如下：
/*
ID:ayludon3
LANG: C++
TASK: ride
*/
#include <iostream>
#include <fstream>
#include <stdio.h>
#include <string.h>
using namespace std;

int main()
{
    ofstream fout ("ride.out");
    ifstream fin ("ride.in");
    char str1[10],str2[10];
    int i,j,x,y,m,n;
    x=y=1;
    while(fin>>str1>>str2)
    {
        for(i=0;i<strlen(str1);i++)
        {
            m=str1[i]-'0'-16;
            x*=m;
        }
        //cout<<"x: "<<x%47<<endl;
        for(j=0;j<strlen(str2);j++)
        {
            n=str2[j]-'0'-16;
            y*=n;
        }
        //cout<<"y: "<<y%47<<endl;
        if(x%47==y%47)
            fout<<"GO"<<endl;
        else
            fout<<"STAY"<<endl;
    }
    return 0;
}