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
#include<stdio.h> #include<string.h> char s[1002]; int main() { int n, len; scanf("%d", &n); while(n--) { scanf("%s", s); len = strlen(s); if(strcmp(s, "1") == 0 || strcmp(s, "4") == 0 || strcmp(s, "78") == 0) printf("+\n"); else if(s[len-1] == '5' && s[len-2] == '3') printf("-\n"); else if(s[0] == '9' && s[len-1] == '4') printf("*\n"); else if(strstr(s, "190") != NULL && strstr(s, "190") - s == 0) printf("?\n"); } return 0; }
解题思路:
我对这题感到无语,看题目就纠结了我很久了:
(个人观点)
1〉开始没有较为醒目的提示说明只能符合这四种情况的S,
2>中间括号对 S35 的解释表示不理解
3>在Output中最后一条语句表示不理解
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