Submission #1747958
Source Code Expand
# pragma GCC optimize("O3") # include <bits/stdc++.h> std::pair<int,int> DR[] = {{-1,0},{0,1},{1,0},{0,-1},{-1,1},{-1,-1},{1,1},{1,-1}}; # define maxn 100005 # define ll long long # define clock (clock() * 1000.0 / CLOCKS_PER_SEC) # define rc(s) return cout << s,0 # define _ ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0); # define db(x) cerr << #x << " = " << x << '\n' # define pb push_back # define mp make_pair # define sz(x) (int)((x).size()) //# define int ll using namespace std; int n,M,a[1 << 17],sum[1 << 17]; map<int,int>m[1 << 17]; int ans; int32_t main(){_ //freopen("input","r",stdin); cin >> n >> M; for(int i = 1;i <= n;i++) { cin >> a[i]; m[a[i] % M][a[i]]++; sum[a[i] % M]++; } for(int i = 0;i <= M / 2;i++) { if((i == 0) || ((M % 2 == 0) && (i == M / 2))) ans += sum[i] / 2; else { int j = i; if(sum[i] < sum[M - i]) j = M - i; ans += sum[M - j]; for(auto it : m[j]) { if((it.second & 1) && sum[M - j]) sum[M - j]--; ans += it.second / 2; } ans -= ((sum[M - j] + 1) / 2); } } rc(ans); }
Submission Info
Submission Time | |
---|---|
Task | D - Pair Cards |
User | nibab |
Language | C++14 (GCC 5.4.1) |
Score | 700 |
Code Size | 1138 Byte |
Status | AC |
Exec Time | 44 ms |
Memory | 11904 KB |
Judge Result
Set Name | sample | all | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 700 / 700 | ||||
Status |
|
|
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 | 4 ms | 6400 KB |
01-02.txt | AC | 38 ms | 9728 KB |
01-03.txt | AC | 37 ms | 9728 KB |
01-04.txt | AC | 38 ms | 9728 KB |
01-05.txt | AC | 37 ms | 9728 KB |
01-06.txt | AC | 37 ms | 9728 KB |
01-07.txt | AC | 37 ms | 9728 KB |
01-08.txt | AC | 33 ms | 9728 KB |
01-09.txt | AC | 30 ms | 9728 KB |
01-10.txt | AC | 23 ms | 9984 KB |
01-11.txt | AC | 21 ms | 10112 KB |
01-12.txt | AC | 12 ms | 6784 KB |
01-13.txt | AC | 12 ms | 6784 KB |
01-14.txt | AC | 43 ms | 11520 KB |
01-15.txt | AC | 44 ms | 11520 KB |
01-16.txt | AC | 42 ms | 11520 KB |
01-17.txt | AC | 39 ms | 11520 KB |
01-18.txt | AC | 35 ms | 11520 KB |
01-19.txt | AC | 30 ms | 11520 KB |
01-20.txt | AC | 22 ms | 11904 KB |
01-21.txt | AC | 21 ms | 7040 KB |
01-22.txt | AC | 20 ms | 7040 KB |
01-23.txt | AC | 18 ms | 7040 KB |
01-24.txt | AC | 15 ms | 7040 KB |
01-25.txt | AC | 14 ms | 7040 KB |
01-26.txt | AC | 14 ms | 7424 KB |
01-27.txt | AC | 13 ms | 9088 KB |
01-28.txt | AC | 4 ms | 6912 KB |
01-29.txt | AC | 3 ms | 6656 KB |
01-30.txt | AC | 3 ms | 6400 KB |
sample-01.txt | AC | 3 ms | 6400 KB |
sample-02.txt | AC | 3 ms | 6400 KB |