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Consider the following crypt-arithmetic constraint satisfaction problem: EAT + THAT APPLE where each letter stands for a distinct digit and leading digits must not be zeroes. Your task is to select, if possible, correct code snippets that could be used in the efficient program based on the interleaving of generate and test technique.

Consider the following crypt-arithmetic constraint satisfaction problem: EAT + THAT APPLE where each letter stands for a distinct digit and leading digits must not be zeroes. Your task is to select, if possible, correct code snippets that could be used in the efficient program based on the interleaving of generate and test technique.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Consider the following crypt-arithmetic constraint satisfaction problem: EAT + THAT APPLE where each letter stands for a distinct digit and leading digits must not be zeroes. Your task is to select, if possible, correct code snippets that could be used in the efficient program based on the interleaving of generate and test technique. Consider the following code snippets. Some of them can be wrong. They possibly represent either efficient or inefficient implementations of constraints. Assume that none of the shown variables was previously instantiated with a specific digit. The last conjunction symbol "," at the end of each line was omitted to avoid confusion, i.e., it remains implicit. Select all code lines, if any, representing a correct efficient implementation of the constraints related to the rightmost part of this puzzle. digit(T), digit(E), not E=T, E is (T+T) mod 10 digit(T), E is T+ E (mod 10), digit(E)
Transcribed Image Text:Consider the following crypt-arithmetic constraint satisfaction problem: EAT + THAT APPLE where each letter stands for a distinct digit and leading digits must not be zeroes. Your task is to select, if possible, correct code snippets that could be used in the efficient program based on the interleaving of generate and test technique. Consider the following code snippets. Some of them can be wrong. They possibly represent either efficient or inefficient implementations of constraints. Assume that none of the shown variables was previously instantiated with a specific digit. The last conjunction symbol "," at the end of each line was omitted to avoid confusion, i.e., it remains implicit. Select all code lines, if any, representing a correct efficient implementation of the constraints related to the rightmost part of this puzzle. digit(T), digit(E), not E=T, E is (T+T) mod 10 digit(T), E is T+ E (mod 10), digit(E)
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