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Problem 1022
Pizza Anyone?
Time Limit: 1000ms
Memory Limit: 65536kb
Description
You are responsible for ordering a large pizza for you and your friends. Each of them has told you what he wants on a pizza and what he does not; of course they all understand that since there is only going to be one pizza, no one is likely to have all their requirements satisfied. Can you order a pizza that will satisfy at least one request from all your friends?
The pizza parlor you are calling offers the following pizza toppings; you can include or omit any of them in a pizza:
Input Code
Topping
A
Anchovies
B
Black Olives
C
Canadian Bacon
D
Diced Garlic
E
Extra Cheese
F
Fresh Broccoli
G
Green Peppers
H
Ham
I
Italian Sausage
J
Jalapeno Peppers
K
Kielbasa
L
Lean Ground Beef
M
Mushrooms
N
Nonfat Feta Cheese
O
Onions
P
Pepperoni
Your friends provide you with a line of text that describes their pizza preferences. For example, the line
+O-H+P;
reveals that someone will accept a pizza with onion, or without ham, or with pepperoni, and the line
-E-I-D+A+J;
indicates that someone else will accept a pizza that omits extra cheese, or Italian sausage, or diced garlic, or that includes anchovies or jalapenos.
Input
The input consists of a series of pizza constraints.
A pizza constraint is a list of 1 to 12 topping constraint lists each on a line by itself followed by a period on a line by itself.
A topping constraint list is a series of topping requests terminated by a single semicolon.
An topping request is a sign character (+/-) and then an uppercase letter from A to P.
Output
For each pizza constraint, provide a description of a pizza that satisfies it. A description is the string "Toppings: " in columns 1 through 10 and then a series of letters, in alphabetical order, listing the toppings on the pizza. So, a pizza with onion, anchovies, fresh broccoli and Canadian bacon would be described by:
Toppings: ACFO
If no combination toppings can be found which satisfies at least one request of every person, your program should print the string "No pizza can satisfy these requests." on a line by itself starting in column 1.
Sample Input
+A+B+C+D-E-F-G-H;
-A-B+C+D-E-F+G+H;
-A+B-C+D-E+F-G+H;
.
+A+B+C+D;
+E+F+F+H;
+A+B-G;
+O+J-F;
+H+I+C;
+P;
+O+M+L;
+M-L+P;
.
+A+B+C+D;
+E+F+F+H;
+A+B-G;
+P-O;
+O+J-F;
+H+I+C;
+P;
+O;
+O+M+L;
-O-P;
+M-L+P;
.
Sample Output
Toppings:
Toppings: CELP
No pizza can satisfy these requests. 
University of Science and Technology of China
Online Judge for ACM/ICPC
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