Submission #1000728


Source Code Expand

#ifdef DEBUG
#define _GLIBCXX_DEBUG
#endif

#include <bits/stdc++.h>

using namespace std;

typedef long double ld;
typedef long long ll;

#ifdef DEBUG
#define eprintf(...) fprintf(stderr, __VA_ARGS__), fflush(stderr)
#else
#define eprintf(...) ;
#endif

#define pb push_back
#define mp make_pair
#define sz(x) ((int) (x).size())
#define TASK "text"

const int inf = (int) 1.01e9;
const ld eps = 1e-9;
const ld pi = acos((ld) -1);

mt19937 mrand(random_device{} ()); 

int rnd(int x) {
  return mrand() % x;
}

void precalc() {
}

const int maxn = (int) 1e5 + 5;
int n;
int a[maxn];

int read() {
  if (scanf("%d", &n) < 1) {
    return false;
  }
  for (int i = 0; i < n; i++) {
    scanf("%d", &a[i]);
  }
  return true;
}

const int logx = 30;
int have[logx];

void solve() {
  int x = 0;
  for (int i = 0; i < logx; i++) {
    have[i] = 0;
  }
  for (int i = 0; i < n; i++) {
    x ^= a[i];
    int bit = 0;
    while (!(a[i] & (1 << bit))) {
      bit++;
    }
    have[bit] = 1;
  }
  int cur = 0;
  int res = 0;
  for (int i = logx - 1; i >= 0; i--) {
    if (((x >> i) & 1) != cur) {
      if (!have[i]) {
        printf("-1\n");
        return;
      }
      res++;
      cur ^= 1;
    }
  }
  printf("%d\n", res);
}

int main() {
  precalc();
#ifdef LOCAL
  assert(freopen(TASK ".in", "r", stdin));
  assert(freopen(TASK ".out", "w", stdout));
#endif
  while (true) {
    if (!read()) {
      break;
    }
    solve();
#ifdef DEBUG
    eprintf("Time %.2f\n", (double) clock() / CLOCKS_PER_SEC);
#endif
  }
  return 0;
}

Submission Info

Submission Time
Task C - Cheating Nim
User aid
Language C++14 (GCC 5.4.1)
Score 500
Code Size 1627 Byte
Status AC
Exec Time 16 ms
Memory 640 KB

Compile Error

./Main.cpp: In function ‘int read()’:
./Main.cpp:45:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &a[i]);
                       ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 500 / 500
Status
AC × 2
AC × 26
Set Name Test Cases
Sample example0.txt, example1.txt
All 000.txt, 001.txt, 002.txt, 003.txt, 004.txt, 005.txt, 006.txt, 007.txt, 008.txt, 009.txt, 010.txt, 011.txt, 012.txt, 013.txt, 014.txt, 015.txt, 016.txt, 017.txt, 018.txt, 019.txt, 020.txt, 021.txt, 022.txt, 023.txt, example0.txt, example1.txt
Case Name Status Exec Time Memory
000.txt AC 3 ms 256 KB
001.txt AC 3 ms 256 KB
002.txt AC 15 ms 640 KB
003.txt AC 8 ms 512 KB
004.txt AC 8 ms 384 KB
005.txt AC 6 ms 384 KB
006.txt AC 16 ms 640 KB
007.txt AC 16 ms 640 KB
008.txt AC 16 ms 640 KB
009.txt AC 16 ms 640 KB
010.txt AC 16 ms 640 KB
011.txt AC 16 ms 640 KB
012.txt AC 16 ms 640 KB
013.txt AC 16 ms 640 KB
014.txt AC 16 ms 640 KB
015.txt AC 16 ms 640 KB
016.txt AC 16 ms 640 KB
017.txt AC 16 ms 640 KB
018.txt AC 16 ms 640 KB
019.txt AC 16 ms 640 KB
020.txt AC 16 ms 640 KB
021.txt AC 4 ms 256 KB
022.txt AC 4 ms 256 KB
023.txt AC 16 ms 640 KB
example0.txt AC 3 ms 256 KB
example1.txt AC 3 ms 384 KB