UVa 621 - Secret Research

Secret Research

At a certain laboratory results of secret research are thoroughly encrypted. A result of a single experiment is stored as an information of its completion:

`positive result', `negative result', `experiment failed' or `experiment not completed'

The encrypted result constitutes a string of digits S, which may take one of the following forms:

positive result 		 S = 1 or S = 4 or S = 78

negative result 		 S = S35

experiment failed 		 S = 9S4

experiment not completed 		 S = 190S

(A sample result S35 means that if we add digits 35 from the right hand side to a digit sequence then we shall get the digit sequence corresponding to a failed experiment)

You are to write a program which decrypts given sequences of digits.

Input 

A integer n stating the number of encrypted results and then consecutive n lines, each containing a sequence of digits given as ASCII strings.

Output 

For each analysed sequence of digits the following lines should be sent to output (in separate lines):

+ 		  for a positive result
- 		  for a negative result
* 		  for a failed experiment
? 		  for a not completed experiment

In case the analysed string does not determine the experiment result, a first match from the above list should be outputted.

Sample Input 

4
78
7835
19078
944

Sample Output 

+
-
?
*

Miguel A. Revilla 

2000-01-10

这道题目只要是明白了意思，就可以了，完全就是if ...else

#include <stdio.h>
#include <string.h>
int main()
{
int i,j,n,m,s,t;
int l;
char s1[1000];
scanf("%d",&n);
while(n--)
{
scanf("%s",s1);
l=strlen(s1);
if(s1[l-1]=='5'&&s1[l-2]=='3')
{
printf("-\n");
}else if(s1[0]=='9'&&s1[l-1]=='4')
{
printf("*\n");
}else if(s1[0]=='1'&&s1[1]=='9'&&s1[2]=='0')
{
printf("?\n");
}else
{
printf("+\n");
}
}
return 0;
}