Submission #375718

#	Time	Username	Problem	Language	Result	Execution time	Memory
375718		YJU	PIN (CEOI10_pin)	C++14	80 / 100	1098 ms	11956 KiB

pin

#include<bits/stdc++.h>
#pragma GCC optimize("unroll-loops,no-stack-protector,Ofast")
using namespace std;
typedef int ll;
typedef long double ld;
typedef pair<ll,ll> pll;
const ll MOD=1e9+9;
const ll MOD2=998244353;
const ll N=5e4+5;
const ld pi=acos(-1);
#define SQ(i) ((i)*(i))
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define pb push_back
#define mp make_pair
#define X first
#define Y second
#define setp setprecision
#define lwb lower_bound
#define SZ(_a) (ll)_a.size()
#define count(_a) (ll)__builtin_popcount(_a)

ll n,d,ans=0,v[N][4];
string s;

ll id[N],cnt[N],dp[16],pre[16];
unordered_map<ll,ll> mm[N];

ll num(char c){
	return ((c>='0'&&c<='9')?c-'0':10+c-'a');
}

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	cin>>n>>d;
	REP(i,n){
		cin>>s;
		REP(j,4)v[i][j]=num(s[j]);
	}
	for(ll mask=0;mask<(1<<4);++mask){
		if(count(mask)!=d)continue;
		vector<ll> vid;
		REP(i,n){
			id[i]=0;
			REP(j,4)if(!((mask>>j)&1)){
				id[i]=id[i]*36+v[i][j];
			}
			vid.pb(id[i]);
		}
		sort(vid.begin(),vid.end());
		vid.erase(unique(vid.begin(),vid.end()),vid.end());
		REP(i,n){
			id[i]=lwb(vid.begin(),vid.end(),id[i])-vid.begin();
			memset(dp,0,sizeof(dp));
			for(int j=0,P=1;j<4;j++,P*=37)pre[(1<<j)]=P*((mask>>j)&1?v[i][j]+1:0);
			for(ll bit=0;bit<(1<<4);++bit){
				dp[bit]=dp[bit-(bit&-bit)]+pre[(bit&-bit)];
				if((bit|mask)>mask)continue;
				ll val=dp[bit];
				if(count(bit)&1){
					ans-=mm[id[i]][val];
					++mm[id[i]][val];
				}else{
					ans+=mm[id[i]][val];
					++mm[id[i]][val];
				}
			}
		}
		REP(i,n){
			mm[id[i]].clear();
		}
	}
	cout<<ans<<"\n";
	return 0;
}

• Subtask 1: 80 / 100