Submission #5017697


Source Code Expand

#include <bits/stdc++.h>
using namespace std;
const int N = 100005;
int cnt[N], sum[N];
int n, m, x, mx;
int main() {
    scanf("%d%d", &n, &m);
    for (int i = 0; i < n; i++) {
        scanf("%d", &x);
        cnt[x % m]++;
        sum[x]++;
        mx = max(mx, x);
    }
    /*for(int i=0;i<m;i++) {
        cout << i << "->" << cnt[i] << endl;
    }*/
    long long ans = cnt[0]/2;
    cnt[0] = 0;
    for (int i = 1; i < m; i++) {
        if (!cnt[i]) continue;
        if(i == m-i) {
            //cout << "add " << cnt[i]/2 << " at " << i << endl;
            ans += cnt[i]/2;
            cnt[i] %= 2;
        } else {
            int res = min(cnt[i], cnt[m-i]);
            //cout << "add " << res << " at " << i << endl;
            ans += res;
            cnt[i] -= res, cnt[m-i] -= res;
        }
    }
    for(int i=0;i<=mx;i++) {
        int pair = min(sum[i], cnt[i%m]);
        //cout << "pair " << pair << " at " << i << endl;
        //cout << sum[i] << "," << cnt[i%m] << endl;
        if(pair < 2) continue;
        cnt[i%m] -= pair/2*2;
        sum[i] -= pair/2*2;
        ans += pair/2;
    }
    cout << ans << endl;
    return 0;
}

Submission Info

Submission Time
Task D - Pair Cards
User vjudge4
Language C++14 (GCC 5.4.1)
Score 700
Code Size 1156 Byte
Status AC
Exec Time 13 ms
Memory 1024 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:7:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
                          ^
./Main.cpp:9:24: 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 × 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 11 ms 640 KB
01-03.txt AC 12 ms 640 KB
01-04.txt AC 12 ms 640 KB
01-05.txt AC 11 ms 640 KB
01-06.txt AC 12 ms 640 KB
01-07.txt AC 12 ms 640 KB
01-08.txt AC 11 ms 640 KB
01-09.txt AC 12 ms 640 KB
01-10.txt AC 12 ms 768 KB
01-11.txt AC 13 ms 1024 KB
01-12.txt AC 11 ms 256 KB
01-13.txt AC 11 ms 256 KB
01-14.txt AC 11 ms 640 KB
01-15.txt AC 11 ms 640 KB
01-16.txt AC 11 ms 640 KB
01-17.txt AC 11 ms 640 KB
01-18.txt AC 11 ms 640 KB
01-19.txt AC 12 ms 640 KB
01-20.txt AC 12 ms 1024 KB
01-21.txt AC 11 ms 640 KB
01-22.txt AC 11 ms 640 KB
01-23.txt AC 11 ms 640 KB
01-24.txt AC 11 ms 640 KB
01-25.txt AC 12 ms 768 KB
01-26.txt AC 12 ms 1024 KB
01-27.txt AC 7 ms 896 KB
01-28.txt AC 2 ms 1024 KB
01-29.txt AC 2 ms 768 KB
01-30.txt AC 2 ms 384 KB
sample-01.txt AC 1 ms 256 KB
sample-02.txt AC 1 ms 256 KB