Submission #1812344


Source Code Expand

#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<ll,ll>
#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,lia[100010],lib[100010];

int main(){
	cin >> n >> m;
	REP(i,0,n) cin >> a,lia[a]++,lib[a%m]++;
	
	int s=lib[0]/2+(!(m%2)?lib[m/2]/2:0);
	for(int i=1;i*2<m;i++){
		int pos=min(lib[i], lib[m-i]);
		lib[i]-=pos;
		lib[m-i]-=pos;
		s+=pos;
	}
	
	REP(i,1,100010){
		if(!(i%m) or (i%m)*2==m) continue;
		int pos=min(lib[i%m]/2, lia[i]/2);
		s+=pos;
		lib[i%m]-=pos*2;
	}
	
	cout << s << endl;
	return 0;
}

Submission Info

Submission Time
Task D - Pair Cards
User ecasdqina
Language C++14 (GCC 5.4.1)
Score 700
Code Size 836 Byte
Status AC
Exec Time 40 ms
Memory 1024 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 2 ms 256 KB
01-02.txt AC 36 ms 640 KB
01-03.txt AC 37 ms 640 KB
01-04.txt AC 36 ms 640 KB
01-05.txt AC 40 ms 768 KB
01-06.txt AC 36 ms 640 KB
01-07.txt AC 37 ms 640 KB
01-08.txt AC 37 ms 640 KB
01-09.txt AC 38 ms 640 KB
01-10.txt AC 37 ms 768 KB
01-11.txt AC 38 ms 1024 KB
01-12.txt AC 38 ms 256 KB
01-13.txt AC 37 ms 384 KB
01-14.txt AC 37 ms 640 KB
01-15.txt AC 38 ms 640 KB
01-16.txt AC 37 ms 640 KB
01-17.txt AC 36 ms 640 KB
01-18.txt AC 37 ms 640 KB
01-19.txt AC 37 ms 640 KB
01-20.txt AC 37 ms 1024 KB
01-21.txt AC 38 ms 640 KB
01-22.txt AC 37 ms 640 KB
01-23.txt AC 36 ms 640 KB
01-24.txt AC 37 ms 640 KB
01-25.txt AC 37 ms 768 KB
01-26.txt AC 37 ms 1024 KB
01-27.txt AC 20 ms 768 KB
01-28.txt AC 3 ms 1024 KB
01-29.txt AC 2 ms 768 KB
01-30.txt AC 2 ms 640 KB
sample-01.txt AC 2 ms 256 KB
sample-02.txt AC 2 ms 256 KB