제출 #930051

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
930051		Stavab	XORanges (eJOI19_xoranges)	C++14	0 / 100	145 ms	5132 KiB

xoranges

#include <iostream>

using namespace std;

int segTree[400005][2];
int oranges[200005];

void init(int N, int l, int r, int i)
{
    if(l == r)
    {
        segTree[N][i] = i == 0 ? oranges[2 * l - 1] : oranges[2 * l]; 
        return;
    }

    int m = (l + r) / 2;
    init(2*N, l, m, i);
    init(2*N + 1, m + 1, r, i);

    segTree[N][i] = segTree[2*N][i] ^ segTree[2*N + 1][i];
}

void update(int N, int l, int r, int i, int pos, int val)
{
    if(l == r)
    {
        segTree[N][i] = val; 
        return;
    }

    int m = (l + r) / 2;
    if(pos <= m)
        update(2*N, l, m, i, pos, val);
    else
        update(2*N + 1, m + 1, r, i, pos, val);

    segTree[N][i] = segTree[2*N][i] ^ segTree[2*N + 1][i];
}

int querry(int N, int l, int r, int i, int ql, int qr)
{
    if(l == ql && r == qr)
        return segTree[N][i];

    int m = (l + r) / 2;
    
    int answer = 0;
    if(ql <= m)
        answer ^= querry(2*N, l, m, i, ql, min(qr, m));
    if(qr > m)
        answer ^= querry(2*N + 1, m + 1, r, i, max(ql, m + 1), qr);

    return answer;
}

int main()
{
    int N, Q;
    scanf("%d %d", &N, &Q);

    for(int i = 1; i <= N; i++)
        scanf("%d", &oranges[i]);

    init(1, 1, (N + 1) / 2, 0);
    init(1, 1, N / 2, 1);

    int a, b, c;
    while(Q--)
    {
        scanf("%d %d %d", &a, &b, &c);

        if(a == 1)
        {
            if(b % 2 == 0)
                update(1, 1, N / 2, 1, b / 2, c);
            else
                update(1, 1, (N + 1) / 2, 0, (b + 1) / 2, c);
        }
        else
        {
            if(c - b + 1 % 2 == 0)
                printf("0\n");
            else
            {
                if(b % 2 == 0)
                    printf("%d\n", querry(1, 1, N / 2, 1, b / 2, c / 2));
                else
                    printf("%d\n", querry(1, 1, (N + 1) / 2, 0, (b + 1) / 2, (c + 1) / 2));
            }
        }
    }

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

xoranges.cpp: In function 'int main()':
xoranges.cpp:59:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |     scanf("%d %d", &N, &Q);
      |     ~~~~~^~~~~~~~~~~~~~~~~
xoranges.cpp:62:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |         scanf("%d", &oranges[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~
xoranges.cpp:70:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         scanf("%d %d %d", &a, &b, &c);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 18
• Subtask 3: 0 / 25
• Subtask 4: 0 / 20
• Subtask 5: 0 / 25