iframe-proxy | Sunbelt Computer Software

22 lines (18 loc) · 653 Bytes

import java.util.*;
class Main {
    public static int n = 5; // 데이터의 개수 N과 데이터 입력받기
    public static int arr[] = {10, 20, 30, 40, 50};
    public static int[] prefixSum = new int[6];
    public static void main(String[] args) {
        // 접두사 합(Prefix Sum) 배열 계산
        int sumValue = 0;
        for (int i = 0; i < n; i++) {
            sumValue += arr[i];
            prefixSum[i + 1] = sumValue;
        // 구간 합 계산(세 번째 수부터 네 번째 수까지)
        int left = 3;
        int right = 4;
        System.out.println(prefixSum[right] - prefixSum[left - 1]);

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