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[BaekJoon] 3046번 - R2 [Java][C++]

[BaekJoon] 3046번 - R2 [Java][C++]

문제 링크


1. 문제 풀이


$S = \dfrac{R1 + R2}{2}$ 이므로 $R2 = 2 \times S - R1$ 이다.


2. 코드


1. 풀이 [Java]

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import java.io.*;
import java.util.*;

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

        int R1 = Integer.parseInt(st.nextToken());
        int S = Integer.parseInt(st.nextToken());

        System.out.println(2 * S - R1);
    }
}


2. 풀이 [C++]

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#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int r1, s;
    cin >> r1 >> s;
    cout << 2 * s - r1;
}

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