Submission #4421424


Source Code Expand

from functools import reduce
from operator import xor

N = int(input())
As = [int(input()) for _ in range(N)]

dXORs = set([A ^ (A-1) for A in As])
XOR = reduce(xor, As)

ans = 0
for i in reversed(range(30)):
    if XOR & (1<<i):
        d = ((1<<(i+1)) - 1)
        if d in dXORs:
            XOR ^= d
            ans += 1

print(ans if XOR == 0 else -1)

Submission Info

Submission Time
Task C - Cheating Nim
User ZollingerPython3
Language Python (3.4.3)
Score 500
Code Size 374 Byte
Status AC
Exec Time 199 ms
Memory 11528 KB

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 28 ms 3700 KB
001.txt AC 22 ms 3572 KB
002.txt AC 196 ms 11528 KB
003.txt AC 123 ms 6024 KB
004.txt AC 100 ms 5896 KB
005.txt AC 72 ms 5000 KB
006.txt AC 189 ms 10748 KB
007.txt AC 185 ms 10760 KB
008.txt AC 195 ms 10760 KB
009.txt AC 182 ms 10756 KB
010.txt AC 190 ms 10756 KB
011.txt AC 192 ms 10752 KB
012.txt AC 197 ms 10752 KB
013.txt AC 191 ms 10760 KB
014.txt AC 192 ms 10764 KB
015.txt AC 186 ms 10764 KB
016.txt AC 199 ms 10876 KB
017.txt AC 190 ms 10752 KB
018.txt AC 196 ms 10616 KB
019.txt AC 188 ms 10768 KB
020.txt AC 194 ms 10888 KB
021.txt AC 38 ms 4196 KB
022.txt AC 38 ms 4192 KB
023.txt AC 187 ms 11528 KB
example0.txt AC 22 ms 3572 KB
example1.txt AC 23 ms 3572 KB