Submission #7134801


Source Code Expand

#include<bits/stdc++.h>
using namespace std;
#define fs first
#define sc second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define ALL(A) A.begin(),A.end()
#define RALL(A) A.rbegin(),A.rend()
typedef long long LL;
typedef pair<LL,LL> P;
const LL mod=1000000007;
const LL LINF=1LL<<60;
const int INF=1<<30;
int dx[]={1,0,-1,0};
int dy[]={0,1,0,-1};



int main(){
    int n,m;cin >> n >> m;
    vector<int> x(n),v(m,0),vv(m,0);
    map<int,int> ma;
    for(int i=0;i<n;i++){
        cin >> x[i];
        ma[x[i]]++;
        v[x[i]%m]++;
    }
    for(auto p:ma){
        vv[p.fs%m] += p.sc / 2;
    }
    LL ans = 0;
    for(int i=0;i<=m/2;i++){
        if((m%2==0&&i==m/2)||i==0){
            ans += v[i] / 2;
        }
        else{
            if(v[i]<v[m-i]){
                ans += v[i];
                ans += min(vv[m-i],(v[m-i] - v[i]) / 2);
            }
            else{
                ans += v[m-i];
                ans += min(vv[i],(v[i] - v[m-i]) / 2);
            }
        }
    }
    cout << ans << endl;
    return 0;
}

Submission Info

Submission Time
Task D - Pair Cards
User Yukly
Language C++14 (GCC 5.4.1)
Score 700
Code Size 1109 Byte
Status AC
Exec Time 80 ms
Memory 6144 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 59 ms 3584 KB
01-03.txt AC 59 ms 3584 KB
01-04.txt AC 59 ms 3584 KB
01-05.txt AC 59 ms 3584 KB
01-06.txt AC 59 ms 3584 KB
01-07.txt AC 59 ms 3584 KB
01-08.txt AC 59 ms 3584 KB
01-09.txt AC 59 ms 3584 KB
01-10.txt AC 60 ms 3968 KB
01-11.txt AC 61 ms 4352 KB
01-12.txt AC 30 ms 640 KB
01-13.txt AC 30 ms 1024 KB
01-14.txt AC 67 ms 5376 KB
01-15.txt AC 67 ms 5376 KB
01-16.txt AC 68 ms 5376 KB
01-17.txt AC 70 ms 5376 KB
01-18.txt AC 69 ms 5376 KB
01-19.txt AC 80 ms 5376 KB
01-20.txt AC 69 ms 6144 KB
01-21.txt AC 39 ms 768 KB
01-22.txt AC 39 ms 768 KB
01-23.txt AC 39 ms 768 KB
01-24.txt AC 39 ms 768 KB
01-25.txt AC 39 ms 1024 KB
01-26.txt AC 40 ms 1536 KB
01-27.txt AC 33 ms 3584 KB
01-28.txt AC 4 ms 1152 KB
01-29.txt AC 2 ms 640 KB
01-30.txt AC 2 ms 1024 KB
sample-01.txt AC 1 ms 256 KB
sample-02.txt AC 1 ms 256 KB