Submission #6141537


Source Code Expand

from collections import Counter
n,m=map(int,input().split())
x=[int(i) for i in input().split()]
v=[[] for i in range(m)]
for i in x:
    v[i%m].append(i)
ans=0
for i in range(1,m//2+1*(m%2==1)):
    d=len(v[i])-len(v[m-i])
    if d<0:
        d=-d
        v[i],v[m-i]=v[m-i],v[i]
    c=sorted(Counter(v[i]).items(),key=lambda x:x[1])
    p=0
    for t in c:
        p+=(t[1]//2)
    ans+=len(v[m-i])+min(p,(d//2))

ans+=len(v[0])//2+(len(v[m//2])//2 if m%2==0 else 0)
print(ans)

Submission Info

Submission Time
Task D - Pair Cards
User keroru
Language PyPy3 (2.4.0)
Score 700
Code Size 498 Byte
Status AC
Exec Time 566 ms
Memory 82028 KB

Judge Result

Set Name sample all
Score / Max Score 0 / 0 700 / 700
Status
AC × 2
AC × 34
Set Name Test Cases
sample sample-01.txt, sample-02.txt
all sample-01.txt, sample-02.txt, 01-01.txt, 01-02.txt, 01-03.txt, 01-04.txt, 01-05.txt, 01-06.txt, 01-07.txt, 01-08.txt, 01-09.txt, 01-10.txt, 01-11.txt, 01-12.txt, 01-13.txt, 01-14.txt, 01-15.txt, 01-16.txt, 01-17.txt, 01-18.txt, 01-19.txt, 01-20.txt, 01-21.txt, 01-22.txt, 01-23.txt, 01-24.txt, 01-25.txt, 01-26.txt, 01-27.txt, 01-28.txt, 01-29.txt, 01-30.txt, sample-01.txt, sample-02.txt
Case Name Status Exec Time Memory
01-01.txt AC 161 ms 38256 KB
01-02.txt AC 204 ms 55920 KB
01-03.txt AC 203 ms 54384 KB
01-04.txt AC 226 ms 54256 KB
01-05.txt AC 220 ms 53104 KB
01-06.txt AC 231 ms 55660 KB
01-07.txt AC 230 ms 53740 KB
01-08.txt AC 260 ms 53356 KB
01-09.txt AC 275 ms 55276 KB
01-10.txt AC 566 ms 82028 KB
01-11.txt AC 491 ms 75372 KB
01-12.txt AC 208 ms 55876 KB
01-13.txt AC 305 ms 58692 KB
01-14.txt AC 203 ms 54380 KB
01-15.txt AC 222 ms 54380 KB
01-16.txt AC 228 ms 53868 KB
01-17.txt AC 238 ms 52460 KB
01-18.txt AC 276 ms 56300 KB
01-19.txt AC 293 ms 57068 KB
01-20.txt AC 327 ms 64236 KB
01-21.txt AC 203 ms 54380 KB
01-22.txt AC 210 ms 52464 KB
01-23.txt AC 213 ms 52336 KB
01-24.txt AC 260 ms 54384 KB
01-25.txt AC 335 ms 59632 KB
01-26.txt AC 343 ms 62316 KB
01-27.txt AC 298 ms 54292 KB
01-28.txt AC 298 ms 51632 KB
01-29.txt AC 327 ms 53612 KB
01-30.txt AC 320 ms 52512 KB
sample-01.txt AC 162 ms 38256 KB
sample-02.txt AC 161 ms 38256 KB