Submission #1318751


Source Code Expand

#include <bits/stdc++.h>
using namespace std;

const int DIM = 1e5 + 5;

int cnt1[DIM], frq[DIM], cnt2[DIM];

int main( void ) {
    
    int n, m;
    cin >> n >> m;
    
    for( int i = 1; i <= n; i ++ ) {
        int x;
        cin >> x;
        
        cnt1[x % m] ++;
        
        frq[x] ++;
        if( frq[x] % 2 == 0 )
            cnt2[x % m] ++;
    }
    
    int ans = cnt1[0] / 2;
    cnt1[0] = 0;
   
    if( m % 2 == 0 ) {
        ans += cnt1[m / 2] / 2;
        cnt1[m / 2] = 0;
    }
    
    for( int i = 1; i <= m / 2; i ++ ) {
        int aux = min( cnt1[i], cnt1[m - i] );
        
        ans += aux;
        cnt1[i] -= aux;
        cnt1[m - i] -= aux;
    }
    
    for( int i = 1; i < m; i ++ )
        ans += min( cnt1[i] / 2, cnt2[i] );
    
    cout << ans << endl;
    return 0;
}

Submission Info

Submission Time
Task D - Pair Cards
User EmanuelNrx
Language C++14 (GCC 5.4.1)
Score 700
Code Size 860 Byte
Status AC
Exec Time 38 ms
Memory 1408 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 1 ms 256 KB
01-02.txt AC 37 ms 640 KB
01-03.txt AC 36 ms 640 KB
01-04.txt AC 38 ms 640 KB
01-05.txt AC 37 ms 640 KB
01-06.txt AC 36 ms 640 KB
01-07.txt AC 36 ms 640 KB
01-08.txt AC 37 ms 640 KB
01-09.txt AC 37 ms 640 KB
01-10.txt AC 37 ms 896 KB
01-11.txt AC 37 ms 1408 KB
01-12.txt AC 37 ms 256 KB
01-13.txt AC 38 ms 384 KB
01-14.txt AC 36 ms 640 KB
01-15.txt AC 36 ms 640 KB
01-16.txt AC 36 ms 640 KB
01-17.txt AC 36 ms 640 KB
01-18.txt AC 36 ms 640 KB
01-19.txt AC 35 ms 640 KB
01-20.txt AC 38 ms 1024 KB
01-21.txt AC 37 ms 640 KB
01-22.txt AC 37 ms 640 KB
01-23.txt AC 38 ms 640 KB
01-24.txt AC 37 ms 640 KB
01-25.txt AC 38 ms 896 KB
01-26.txt AC 38 ms 1408 KB
01-27.txt AC 19 ms 896 KB
01-28.txt AC 3 ms 1152 KB
01-29.txt AC 2 ms 768 KB
01-30.txt AC 2 ms 640 KB
sample-01.txt AC 1 ms 256 KB
sample-02.txt AC 1 ms 256 KB