Submission #229737

#	Time	Username	Problem	Language	Result	Execution time	Memory
229737		Coder	XORanges (eJOI19_xoranges)	C++14	100 / 100	150 ms	3140 KiB

xoranges

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define SZ(x) (int)(x.size())
#define F0(i,n) for(int i=0;i<n;i++)
#define F1(i,n) for(int i=1;i<=n;i++)
#define CL(a,x) memset(x, a, sizeof(x));
#define PR(x) cerr << #x << "=" << (x) << endl;
const int inf = 1000000009;
const double pi = atan(1.0)*4.0;
const double eps = 1e-8;
const int N = 200001;
int i, j, k, m, n;
int a[N];

int h[2][N];
void add(int ind, int x, int val) {
    while (x <= n/2+1) {
        h[ind][x] ^= val;
        x = (x|(x-1)) + 1;
    }
}
int get(int ind, int x) {
    int ret = 0;
    while (x) {
        ret ^= h[ind][x];
        x &= (x-1);
    }
    return ret;
}
int main() {
    //freopen("x.in", "r", stdin);

    int q, t;
    cin >> n >> q;
    F1(i, n) {
        scanf("%d", &a[i]);
        add(i % 2, (i + 1) / 2, a[i]);
    }
    while (q--) {
        scanf("%d%d%d", &t, &i, &j);
        if (t == 1) {
            add(i % 2, (i + 1) / 2, a[i]);
            a[i] = j;
            add(i % 2, (i + 1) / 2, a[i]);
        } else {
            int len = j - i + 1;
            int ret = 0;
            if (len % 2) {
                ret = get(j % 2, (j + 1) / 2) ^ get(i % 2, (i - 1) / 2);
            }
          printf("%d\n", ret);
        }
    }


    return 0;
}

Compilation message (stderr)

xoranges.cpp: In function 'int main()':
xoranges.cpp:38:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &a[i]);
         ~~~~~^~~~~~~~~~~~~
xoranges.cpp:42:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d", &t, &i, &j);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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