Submission #992055


Source Code Expand

#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ld = long double;
using D = double;
using uint = unsigned int;

#ifdef WIN32
    #define LLD "%I64d"
#else
    #define LLD "%lld"
#endif

#define pb push_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second

map<int, int> kv;
vector<int> cnt[100005];
int n, m;

int main()
{
    scanf("%d%d", &n, &m);
    for (int i = 0; i < n; i++)
    {
        int x;
        scanf("%d", &x);
        kv[x]++;
    }
    for (auto t : kv) if (t.se % 2 == 1)
    {
        cnt[t.fi % m].pb(t.fi);
    }
    for (auto t : kv)
    {
        for (int i = 0; i < t.se - t.se % 2; i++) cnt[t.fi % m].pb(t.fi);
    }
    int answer = 0;
    for (int i = 0; i * 2 <= m; i++)
    {
        if (i + i == m || i == 0)
        {
            int k = cnt[i].size() / 2;
            for (auto t = 0; t < 2 * k; t++) kv[cnt[i][t]]--;
            answer += k;
        }
        else
        {
            int k = min(cnt[i].size(), cnt[m - i].size());
            for (auto t = 0; t < k; t++) kv[cnt[i][t]]--;
            for (auto t = 0; t < k; t++) kv[cnt[m - i][t]]--;
            answer += k;
        }
    }
    for (auto t : kv)
    {
        answer += t.se / 2;
    }
    printf("%d\n", answer);
    return 0;
}

Submission Info

Submission Time
Task D - Pair Cards
User KAN
Language C++14 (GCC 5.4.1)
Score 700
Code Size 1373 Byte
Status AC
Exec Time 80 ms
Memory 10368 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:28:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
                          ^
./Main.cpp:32:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &x);
                        ^

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 5 ms 2560 KB
01-02.txt AC 55 ms 6144 KB
01-03.txt AC 57 ms 6080 KB
01-04.txt AC 58 ms 6144 KB
01-05.txt AC 59 ms 6144 KB
01-06.txt AC 61 ms 6272 KB
01-07.txt AC 63 ms 6016 KB
01-08.txt AC 63 ms 6144 KB
01-09.txt AC 62 ms 6144 KB
01-10.txt AC 60 ms 6784 KB
01-11.txt AC 59 ms 7552 KB
01-12.txt AC 16 ms 3196 KB
01-13.txt AC 16 ms 3196 KB
01-14.txt AC 67 ms 7932 KB
01-15.txt AC 75 ms 7936 KB
01-16.txt AC 78 ms 7936 KB
01-17.txt AC 80 ms 7808 KB
01-18.txt AC 76 ms 8064 KB
01-19.txt AC 72 ms 7936 KB
01-20.txt AC 72 ms 10368 KB
01-21.txt AC 26 ms 3232 KB
01-22.txt AC 26 ms 3328 KB
01-23.txt AC 26 ms 3328 KB
01-24.txt AC 27 ms 3328 KB
01-25.txt AC 26 ms 3456 KB
01-26.txt AC 25 ms 3456 KB
01-27.txt AC 33 ms 6656 KB
01-28.txt AC 7 ms 2816 KB
01-29.txt AC 5 ms 2688 KB
01-30.txt AC 5 ms 2560 KB
sample-01.txt AC 5 ms 2560 KB
sample-02.txt AC 5 ms 2560 KB