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 |
|
|
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 |