Submission #813300

#	Time	Username	Problem	Language	Result	Execution time	Memory
813300		arnold518	Garden (JOI23_garden)	C++17	100 / 100	2601 ms	15204 KiB

garden

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 5e5;
const int MAXD = 5000;
const ll INF = 1e18;

int N, M, D;
vector<int> B[MAXD+10];
int P[MAXD+10], Q[MAXD*2+10];
vector<pii> V[MAXD+10];
set<int> C[MAXD*2+10];

struct Data
{
    int L[MAXD+10], R[MAXD+10], cnt=0, val=0;
    vector<int> V;

    void init()
    {
        for(int i=0; i<D; i++) L[i]=-1, R[i]=-1; 
        V.clear(); cnt=0; val=0;
    }

    void insert(int x)
    {
        L[x]=R[x]=x;
        V.push_back(x);
        cnt++;
    }

    void init2()
    {
        for(int i=1; i<D; i++) if(L[i]!=i) L[i]=L[i-1];
        if(L[0]!=0) L[0]=L[D-1];
        for(int i=1; i<D; i++) if(L[i]!=i) L[i]=L[i-1];

        for(int i=D-2; i>=0; i--) if(R[i]!=i) R[i]=R[i+1];
        if(R[D-1]!=D-1) R[D-1]=R[0];
        for(int i=D-2; i>=0; i--) if(R[i]!=i) R[i]=R[i+1];

        sort(V.begin(), V.end());
        for(int i=0; i+1<V.size(); i++) val=max(val, V[i+1]-V[i]);
        if(!V.empty()) val=max(val, V[0]+D-V.back());
    }

    int FindL(int x)
    {
        if(x==-1) return FindL(D-1);
        if(x==L[x]) return x;
        return L[x]=FindL(L[x]);
    }
    int FindR(int x)
    {
        if(x==D) return FindR(0);
        if(x==R[x]) return x;
        return R[x]=FindR(R[x]);
    }

    void Delete(int x)
    {
        cnt--;
        assert(L[x]==x); assert(R[x]==x);
        int p=FindL(x-1), q=FindR(x+1);
        if(p<q) val=max(val, q-p);
        else val=max(val, q+D-p);
        L[x]=x-1; if(x==0) L[x]=D-1;
        R[x]=x+1; if(x==D-1) R[x]=0;
    }

    int query()
    {
        if(cnt<=1) return 1;
        else return D-val+1;
    }
}DB;

ll ans=INF;

int main()
{
    scanf("%d%d%d", &N, &M, &D);
    for(int i=1; i<=N; i++)
    {
        int y, x;
        scanf("%d%d", &x, &y);
        P[x]=1; Q[y]=1; Q[y+D]=1;
    }
    for(int i=1; i<=M; i++)
    {
        int y, x;
        scanf("%d%d", &x, &y);
        if(P[x]) continue;
        B[x].push_back(y);
    }

    for(int i=0; i<D; i++)
    {
        if(B[i].empty()) continue;
        sort(B[i].begin(), B[i].end());
        B[i].erase(unique(B[i].begin(), B[i].end()), B[i].end());

        V[0].push_back({B[i].back(), i+1});
        int t=B[i].back();
        for(auto it : B[i])
        {
            V[it+1].push_back({t, -i});
            V[it+1].push_back({it+D, i+1});
            t=it+D;
        }
    }

    for(int i=0; i<D; i++)
    {
        DB.init();
        for(int j=0; j<D; j++) if(P[j]) DB.insert(j);

        int val=i;
        for(int j=D+i-1; j>=i; j--) if(Q[j]) { val=j; break; }

        for(auto [y, x] : V[i])
        {
            if(x>0) C[y].insert(x-1);
            else C[y].erase(-x);
        }

        for(int j=val; j<D+i; j++) for(auto it : C[j]) DB.insert(it);
        DB.init2();

        for(int j=val; j<D+i; j++)
        {
            for(auto it : C[j]) DB.Delete(it);
            ans=min(ans, (ll)DB.query()*(j-i+1));
        }
    }
    printf("%lld\n", ans);
}

Compilation message (stderr)

garden.cpp: In member function 'void Data::init2()':
garden.cpp:47:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         for(int i=0; i+1<V.size(); i++) val=max(val, V[i+1]-V[i]);
      |                      ~~~^~~~~~~~~
garden.cpp: In function 'int main()':
garden.cpp:86:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   86 |     scanf("%d%d%d", &N, &M, &D);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
garden.cpp:90:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |         scanf("%d%d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~
garden.cpp:96:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   96 |         scanf("%d%d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 6 / 6
• Subtask 3: 8 / 8
• Subtask 4: 16 / 16
• Subtask 5: 30 / 30
• Subtask 6: 25 / 25