题解 | 小红的魔法药剂

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;


public class Main {
   public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));

        int n = Integer.parseInt(br.readLine());

        String[] str = br.readLine().split("\\s+");
        int[] redStr = new int[str.length];

        for (int i = 0; i < str.length; i++) {
            redStr[i] = Integer.parseInt(str[i]);
        }

        int sum = 0;
        // 遍历每种药剂
        for (int i = 0; i < n; i++) {
            // 读取合成第i种蓝色药剂所需的两种红色药剂的编号b和c
            String[] split = br.readLine().split("\\s+");
            int b = Integer.parseInt(split[0]);
            int c = Integer.parseInt(split[1]);

            // 计算合成第i种蓝色药剂的花费，即所需两种红色药剂价格之和
            int blue = redStr[b - 1] + redStr[c - 1];
            // 获取直接购买第i种红色药剂的花费
            int red = redStr[i];

            // 选择合成蓝色药剂和直接购买红色药剂两者花费较小的值，累加到总花费sum中
            sum += Math.min(blue, red);
        }

        out.println(sum);
        out.close();
        br.close();
    }   
    
}