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32 lines
1.0 KiB
32 lines
1.0 KiB
import java.util.List;
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import java.util.Random;
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/**
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* 生成初中题目
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*/
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public class JuniorProblem implements ProblemsGenerator {
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private static final Random RANDOM = new Random();
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private final BracketManager bracketManager = new BracketManager();
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private final PowerManager powerManager = new PowerManager();
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private final ExpressionBuilder expressionBuilder = new ExpressionBuilder();
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@Override
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public String generate() {
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String expression;
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boolean hasPower;
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do {
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int numCount = RANDOM.nextInt(5) + 1;
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expression = expressionBuilder.generateBasicExpression(numCount);
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expression = bracketManager.addNestedParentheses(expression);
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List<Integer> numPositions = expressionBuilder.getNumberPositions(expression);
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expression = powerManager.addPowerOperations(expression, numPositions, null);
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hasPower = expression.contains("^2") || expression.contains("√");
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} while (expressionBuilder.hasDivideByZero(expression) || !hasPower);
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return expression;
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}
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}
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