Submission #5874479


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#include <bits/stdc++.h>
using namespace std;
#define int long long
#define rep(i,n) for(int i=0;i<(n);i++)

signed main(){
	int n,m;cin>>n>>m;
	vector<int>x(n);
	for(auto&& u:x)cin>>u;
	map<int,int>cnt,cntp,cntm;
	for(auto&& u:x){cnt[u]++;cntm[u%m]++;}
	for(auto&& u:cnt){cntp[u.first%m]+=u.second/2;}

	int ret=0;
	ret+=cntm[0]/2;
	if(m%2==0)ret+=cntm[m/2]/2;
	for(int i=1;i<=(m-1)/2;i++){
		int x=i,y=m-x;
		if(cntm[x]>cntm[y])swap(x,y);
		int nx=cntm[x],ny=cntm[y];
		ret+=nx;
		ret+=min((ny-nx)/2,cntp[y]);
	}
	cout<<ret<<endl;

}

Submission Info

Submission Time
Task D - Pair Cards
User mnrutd
Language C++14 (GCC 5.4.1)
Score 700
Code Size 562 Byte
Status
Exec Time 182 ms
Memory 19840 KB

Judge Result

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 58 ms 4992 KB
01-03.txt 60 ms 4992 KB
01-04.txt 60 ms 4992 KB
01-05.txt 61 ms 4992 KB
01-06.txt 62 ms 4992 KB
01-07.txt 63 ms 4992 KB
01-08.txt 69 ms 4992 KB
01-09.txt 75 ms 5248 KB
01-10.txt 105 ms 9728 KB
01-11.txt 130 ms 15616 KB
01-12.txt 30 ms 1024 KB
01-13.txt 47 ms 5120 KB
01-14.txt 67 ms 7296 KB
01-15.txt 68 ms 7296 KB
01-16.txt 72 ms 7296 KB
01-17.txt 78 ms 7296 KB
01-18.txt 86 ms 7680 KB
01-19.txt 97 ms 8832 KB
01-20.txt 182 ms 19840 KB
01-21.txt 38 ms 1280 KB
01-22.txt 39 ms 1280 KB
01-23.txt 41 ms 1280 KB
01-24.txt 46 ms 1408 KB
01-25.txt 60 ms 4096 KB
01-26.txt 84 ms 10624 KB
01-27.txt 94 ms 13184 KB
01-28.txt 38 ms 9856 KB
01-29.txt 13 ms 3968 KB
01-30.txt 47 ms 9600 KB
sample-01.txt 1 ms 256 KB
sample-02.txt 1 ms 256 KB