CodeSprout 官方2026/10/04 00:19

官方解答 · 置頂Java

官方解答｜算式正值統計

CodeSprout 官方解答 · 題意分析、解題步驟與完整參考程式

import java.util.*;

public class Solution {

    public static List<Integer> solve(String[] records) {
        List<Integer> result = new ArrayList<>();
        for (String record : records) {
            String[] parts = record.trim().split(" +");
            int a = Integer.parseInt(parts[0]);
            int b = Integer.parseInt(parts[2]);
            int c = Integer.parseInt(parts[4]);
            String left = parts[1], right = parts[3];
            int x;
            if (left.equals("*")) {
                int first = a*b;
                x = right.equals("*") ? first*c : right.equals("+") ? first+c : first-c;
            } else {
                int tail = right.equals("*") ? b*c : b;
                x = left.equals("+") ? a+tail : a-tail;
                if (!right.equals("*")) x = right.equals("+") ? x+c : x-c;
            }
            result.add(Math.abs(x));
        }
        int count=0;
        for (int x : result) if (x>0) count++;
        return Arrays.asList(count);
    }
}