Contest Duration: ~ (local time)

Submission #1920399

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```#include <bits/stdc++.h>
#define REP(i,a,b) for(int i=(a);i<(b);i++)
#define RREP(i,a,b) for(int i=(a);i>=(b);i--)
#define pq priority_queue
#define P pair<int,int>
#define P2 pair<int,P>
#define P3 pair<int,P2>
typedef long long ll; typedef long double ld;
using namespace std;
const int INF=1e9, MOD=1e9+7, around[]={0,1,1,-1,-1,0,-1,1,0,0};
const ll LINF=1e18;
const ld PI=abs(acos(-1));
int n,m,a[100010],li[100010],li2[100010];

int main(){
cin >> n >> m;
REP(i,0,n) cin >> a[i],li[a[i]%m]++;
sort(a,a+n);
REP(i,0,n-1) if(a[i]==a[i+1]) i++,li2[a[i]%m]++;
int pos=li[0]/2;
REP(i,1,m/2+1){
if(i==m-i){pos+=li[i]/2; continue;}
int mi=min(li[i],li[m-i]);
pos+=mi; li[i]-=mi; li[m-i]-=mi;
pos+=min(li2[i],li[i]/2);
pos+=min(li2[m-i],li[m-i]/2);
}
cout << pos << endl;
return 0;
}
```

#### Submission Info

Submission Time 2017-12-30 08:36:18+0900 D - Pair Cards ecasdqina C++14 (GCC 5.4.1) 700 829 Byte AC 44 ms 1408 KB

#### Test Cases

Set Name Score / Max Score Test Cases
sample 0 / 0 sample-01.txt, sample-02.txt
all 700 / 700 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 1 ms 256 KB
01-02.txt 42 ms 640 KB
01-03.txt 42 ms 640 KB
01-04.txt 42 ms 640 KB
01-05.txt 43 ms 640 KB
01-06.txt 43 ms 640 KB
01-07.txt 43 ms 640 KB
01-08.txt 42 ms 640 KB
01-09.txt 43 ms 640 KB
01-10.txt 42 ms 896 KB
01-11.txt 44 ms 1408 KB
01-12.txt 38 ms 640 KB
01-13.txt 39 ms 768 KB
01-14.txt 44 ms 640 KB
01-15.txt 43 ms 640 KB
01-16.txt 42 ms 640 KB
01-17.txt 42 ms 640 KB
01-18.txt 43 ms 640 KB
01-19.txt 42 ms 640 KB
01-20.txt 43 ms 1024 KB
01-21.txt 41 ms 640 KB
01-22.txt 41 ms 640 KB
01-23.txt 41 ms 640 KB
01-24.txt 41 ms 640 KB
01-25.txt 42 ms 896 KB
01-26.txt 42 ms 1408 KB
01-27.txt 22 ms 896 KB
01-28.txt 3 ms 768 KB
01-29.txt 2 ms 384 KB
01-30.txt 2 ms 640 KB
sample-01.txt 1 ms 256 KB
sample-02.txt 1 ms 256 KB