#include <bits/stdc++.h>
using namespace std;
int n, m, q;
vector<int> a, values;
vector<int> segTree;
void build(int x, int l, int r) {
if (l == r) {
segTree[x] = values[l];
return;
}
int mid = (l+r)/2;
build(2*x, l, mid);
build(2*x+1, mid+1, r);
segTree[x] = segTree[2*x] ^ segTree[2*x+1];
}
void update(int x, int l, int r, int i, int v) {
if (l == r) {
segTree[x] = values[l] = v;
return;
}
int mid = (l+r)/2;
if (i <= mid) {
update(2*x, l, mid, i, v);
} else{
update(2*x+1, mid+1, r, i, v);
}
segTree[x] = segTree[2*x] ^ segTree[2*x+1];
}
int getRange(int x, int l, int r, int lb, int rb) {
if (rb <= l or r <= lb) {
return 0;
} else if (lb <= l and r <= rb) {
return segTree[x];
} else {
int mid = (l+r)/2;
int xor1 = getRange(2*x, l, mid, lb, rb);
int xor2 = getRange(2*x+1, mid+1, r, lb, rb);
return xor1 ^ xor2;
}
}
int main() {
// ios::sync_with_stdio(false);
// cin.tie(NULL);
cin >> n >> q;
a = vector<int>(n);
for (int& i: a) cin >> i;
m = (n+1)/2;
values = vector<int>(m);
for (int i = 0; i < m; i++) {
values[i] = a[2*i];
}
segTree = vector<int>(4*m, 0);
build(1, 0, m-1);
// cout << "ok\n";
int type, i, val, l, r;
while (q--) {
cin >> type;
if (type == 1) { // rescan
cin >> i >> val;
a[i-1] = val;
if (i % 2 == 1) {
i /= 2;
update(1, 0, m-1, i, val);
}
} else { // query
cin >> l >> r;
int range = r-l+1;
if (l == r) {
cout << a[l-1] << '\n';
} else if (range % 2 == 0) {
cout << "0\n";
} else {
l /= 2;
r /= 2;
cout << getRange(1, 0, m-1, l, r) << '\n';
}
}
}
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
2 ms |
212 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
535 ms |
9008 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
212 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |