oj.uz

Submission #1070836

# Submission time Handle Problem Language Result Execution time Memory
1070836 2024-08-22T19:21:52 Z matthew XORanges (eJOI19_xoranges) C++17
100 / 100
 76 ms 8436 KB 
#include <stdio.h>
#include <assert.h>

const int MAXN = 200'000;

int v[MAXN + 1];

// poate fi optimizat la un singur N de memorie
int aib_par[MAXN + 1];
int aib_impar[MAXN + 1];

void pointUpdate(int *aib, int pos, int delta, int n) {
  while(pos <= n) {
    aib[pos] ^= delta;
    pos += pos & -pos;
  }
}

int prefixQuery(int *aib, int pos) {
  int res = 0;
  while(pos > 0) {
    res ^= aib[pos];
    pos &= pos - 1;
  }
  return res;
}

static inline int rangeQuery(int *aib, int l, int r) {
  return prefixQuery(aib, r) ^ prefixQuery(aib, l - 1);
}

int main() {
  #ifdef LOCAL
freopen("input.txt", "r", stdin);
  #endif

  int n, q, i, l, r, type, pos, val;

  scanf("%d%d", &n, &q);
  for(i = 1; i <= n; i++) {
    scanf("%d", &v[i]);
    pointUpdate((i & 1) ? aib_impar : aib_par, i, v[i], n);
  }

  for(i = 0; i < q; i++) {
    scanf("%d", &type);

    if(type == 2) {
      scanf("%d%d", &l, &r);

      if((r - l) & 1) {
        printf("0\n");
      } else {
        printf("%d\n", rangeQuery((l & 1) ? aib_impar : aib_par, l, r));
      }
    } else {
      scanf("%d%d", &pos, &val);
      pointUpdate((pos & 1) ? aib_impar : aib_par, pos, v[pos] ^ val, n);
      v[pos] = val;
    }
  }

  return 0;
}

Compilation message

xoranges.cpp: In function 'int main()':
xoranges.cpp:39:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |   scanf("%d%d", &n, &q);
      |   ~~~~~^~~~~~~~~~~~~~~~
xoranges.cpp:41:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |     scanf("%d", &v[i]);
      |     ~~~~~^~~~~~~~~~~~~
xoranges.cpp:46:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |     scanf("%d", &type);
      |     ~~~~~^~~~~~~~~~~~~
xoranges.cpp:49:12: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |       scanf("%d%d", &l, &r);
      |       ~~~~~^~~~~~~~~~~~~~~~
xoranges.cpp:57:12: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |       scanf("%d%d", &pos, &val);
      |       ~~~~~^~~~~~~~~~~~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 428 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct

Subtask #2
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 428 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 2 ms 604 KB Output is correct
12 Correct 2 ms 604 KB Output is correct
13 Correct 2 ms 604 KB Output is correct
14 Correct 2 ms 604 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 65 ms 3924 KB Output is correct
2 Correct 68 ms 3924 KB Output is correct
3 Correct 74 ms 3920 KB Output is correct
4 Correct 59 ms 3936 KB Output is correct
5 Correct 64 ms 3920 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 428 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 2 ms 604 KB Output is correct
12 Correct 2 ms 604 KB Output is correct
13 Correct 2 ms 604 KB Output is correct
14 Correct 2 ms 604 KB Output is correct
15 Correct 65 ms 3924 KB Output is correct
16 Correct 68 ms 3924 KB Output is correct
17 Correct 74 ms 3920 KB Output is correct
18 Correct 59 ms 3936 KB Output is correct
19 Correct 64 ms 3920 KB Output is correct
20 Correct 76 ms 8436 KB Output is correct
21 Correct 67 ms 8272 KB Output is correct
22 Correct 67 ms 8276 KB Output is correct
23 Correct 64 ms 8276 KB Output is correct
24 Correct 69 ms 8412 KB Output is correct