oj.uz

Submission #467128

# Submission time Handle Problem Language Result Execution time Memory
467128 2021-08-21T18:38:11 Z radaiosm7 XORanges (eJOI19_xoranges) C++
100 / 100
 154 ms 11248 KB 
#include <bits/stdc++.h>
using namespace std;
int n, q, i, a, b, quer;
int c[200005];
int seg[2][800020];

void Update(int start=1, int ende=n, int indx=1) {
  if (start == ende) {
    seg[a&1][indx] = b;
    return;
  }

  int mid = (start+ende)/2;
  if (a <= mid) Update(start, mid, 2*indx);
  else Update(mid+1, ende, 2*indx+1);
  seg[a&1][indx] = seg[a&1][2*indx]^seg[a&1][2*indx+1];
}

int Query(int from, int to, int start=1, int ende=n, int indx=1) {
  if (from == start && to == ende) return seg[a&1][indx];
  int mid = (start+ende)/2;
  if (to <= mid) return Query(from, to, start, mid, 2*indx);
  else if (from > mid) return Query(from, to, mid+1, ende, 2*indx+1);
  else return Query(from, mid, start, mid, 2*indx)^Query(mid+1, to, mid+1, ende, 2*indx+1);
}

void Build(int start=1, int ende=n, int indx=1) {
  if (start == ende) {
    seg[start&1][indx] = c[start];
    return;
  }

  int mid = (start+ende)/2;
  Build(start, mid, 2*indx);
  Build(mid+1, ende, 2*indx+1);

  seg[0][indx] = seg[0][2*indx]^seg[0][2*indx+1];
  seg[1][indx] = seg[1][2*indx]^seg[1][2*indx+1];
}

int main() {
  scanf("%d%d", &n, &q);
  for (i=1; i <= n; ++i) scanf("%d", &c[i]);
  Build();

  while (q--) {
    scanf("%d%d%d", &quer, &a, &b);
    if (quer == 1) Update();
    else if ((a&1) != (b&1)) printf("0\n");
    else printf("%d\n", Query(a, b));
  }

  return 0;
}

Compilation message

xoranges.cpp: In function 'int main()':
xoranges.cpp:42:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |   scanf("%d%d", &n, &q);
      |   ~~~~~^~~~~~~~~~~~~~~~
xoranges.cpp:43:31: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |   for (i=1; i <= n; ++i) scanf("%d", &c[i]);
      |                          ~~~~~^~~~~~~~~~~~~
xoranges.cpp:47:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |     scanf("%d%d%d", &quer, &a, &b);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct

Subtask #2
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 4 ms 588 KB Output is correct
12 Correct 4 ms 588 KB Output is correct
13 Correct 3 ms 588 KB Output is correct
14 Correct 3 ms 588 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 151 ms 11204 KB Output is correct
2 Correct 149 ms 11204 KB Output is correct
3 Correct 148 ms 11248 KB Output is correct
4 Correct 132 ms 10888 KB Output is correct
5 Correct 133 ms 10924 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 4 ms 588 KB Output is correct
12 Correct 4 ms 588 KB Output is correct
13 Correct 3 ms 588 KB Output is correct
14 Correct 3 ms 588 KB Output is correct
15 Correct 151 ms 11204 KB Output is correct
16 Correct 149 ms 11204 KB Output is correct
17 Correct 148 ms 11248 KB Output is correct
18 Correct 132 ms 10888 KB Output is correct
19 Correct 133 ms 10924 KB Output is correct
20 Correct 150 ms 10900 KB Output is correct
21 Correct 154 ms 10948 KB Output is correct
22 Correct 153 ms 10828 KB Output is correct
23 Correct 134 ms 10780 KB Output is correct
24 Correct 133 ms 10808 KB Output is correct