Submission #992695


Source Code Expand

#include <bits/stdc++.h>
using namespace std;
int main() {
	int N, M;
	cin >> N >> M;
	map<int,int> cnt;
	for (int i = 0; i < N; ++ i) {
		int x;
		cin >> x;
		++cnt[x];
	}
	map<int,int> a;
	map<int,int> b;
	for (auto p : cnt) {
		a[p.first % M] += p.second;
		b[p.first % M] += p.second / 2;
	}
	int r = 0;
	for (int i = 0; i <= M-i; ++ i) {
		if (i == 0 || i == M-i) {
			r += a[i] / 2;
		} else {
			int p = min(a[i], a[M-i]);
			r += p;
			a[i] -= p;
			a[M-i] -= p;
			r += min(a[i]/2, b[i]);
			r += min(a[M-i]/2, b[M-i]);
		}
	}
	cout << r << endl;
}

Submission Info

Submission Time
Task D - Pair Cards
User hasi
Language C++14 (GCC 5.4.1)
Score 700
Code Size 590 Byte
Status AC
Exec Time 188 ms
Memory 14336 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 3 ms 256 KB
01-02.txt AC 60 ms 3200 KB
01-03.txt AC 61 ms 3200 KB
01-04.txt AC 60 ms 3200 KB
01-05.txt AC 61 ms 3200 KB
01-06.txt AC 61 ms 3200 KB
01-07.txt AC 62 ms 3200 KB
01-08.txt AC 68 ms 3200 KB
01-09.txt AC 68 ms 3328 KB
01-10.txt AC 94 ms 6912 KB
01-11.txt AC 154 ms 12544 KB
01-12.txt AC 30 ms 256 KB
01-13.txt AC 60 ms 4352 KB
01-14.txt AC 68 ms 4864 KB
01-15.txt AC 68 ms 4992 KB
01-16.txt AC 72 ms 4992 KB
01-17.txt AC 78 ms 4992 KB
01-18.txt AC 80 ms 5248 KB
01-19.txt AC 87 ms 6144 KB
01-20.txt AC 188 ms 14336 KB
01-21.txt AC 39 ms 384 KB
01-22.txt AC 39 ms 384 KB
01-23.txt AC 40 ms 512 KB
01-24.txt AC 41 ms 512 KB
01-25.txt AC 55 ms 3328 KB
01-26.txt AC 94 ms 9856 KB
01-27.txt AC 129 ms 11904 KB
01-28.txt AC 57 ms 9728 KB
01-29.txt AC 21 ms 3968 KB
01-30.txt AC 76 ms 9600 KB
sample-01.txt AC 3 ms 256 KB
sample-02.txt AC 3 ms 256 KB