Submission #994701


Source Code Expand

#include <iostream>
#include <vector>
#include <cmath>
#include <algorithm>
using namespace std;


int main() {
    int N, M;
    cin >> N >> M;
    vector<int> x(N);
    vector<int> m(M);
    int ans = 0;
    for(int i=0; i<N; ++i) {
        cin >> x[i];
    }
    sort(x.begin(), x.end());
    for(int i=0; i<N; ++i) {
        m[x[i] % M]++;
    }
    for(int i=1; i<N;) {
        if(x[i] % M != 0 && x[i] == x[i-1] && m[x[i] % M] > m[M - (x[i] % M)] ) {
            ans++;
            m[x[i] % M] -= 2;
            i += 2;
        } else {
            i++;
        }
    }
    ans += m[0]/2;
    for(int i=1; i<M/2 + (M%2 == 0 ? 0 : 1); ++i) {
        ans += min(m[i], m[M-i]);
    }
    if(M % 2 == 0) {
        ans += m[M/2]/2;
    }
    cout << ans << endl;
}

Submission Info

Submission Time
Task D - Pair Cards
User Suibaka
Language C++14 (GCC 5.4.1)
Score 700
Code Size 804 Byte
Status AC
Exec Time 38 ms
Memory 1024 KB

Judge Result

Set Name sample all
Score / Max Score 0 / 0 700 / 700
Status
AC × 2
AC × 32
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
Case Name Status Exec Time Memory
01-01.txt AC 2 ms 256 KB
01-02.txt AC 37 ms 640 KB
01-03.txt AC 37 ms 640 KB
01-04.txt AC 37 ms 640 KB
01-05.txt AC 37 ms 640 KB
01-06.txt AC 37 ms 640 KB
01-07.txt AC 37 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 768 KB
01-11.txt AC 38 ms 1024 KB
01-12.txt AC 32 ms 640 KB
01-13.txt AC 32 ms 768 KB
01-14.txt AC 37 ms 640 KB
01-15.txt AC 37 ms 640 KB
01-16.txt AC 37 ms 640 KB
01-17.txt AC 37 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 36 ms 640 KB
01-22.txt AC 36 ms 640 KB
01-23.txt AC 36 ms 640 KB
01-24.txt AC 36 ms 640 KB
01-25.txt AC 36 ms 768 KB
01-26.txt AC 36 ms 1024 KB
01-27.txt AC 20 ms 768 KB
01-28.txt AC 4 ms 640 KB
01-29.txt AC 3 ms 384 KB
01-30.txt AC 3 ms 640 KB
sample-01.txt AC 2 ms 256 KB
sample-02.txt AC 2 ms 256 KB