Submission #965627

#	Time	Username	Problem	Language	Result	Execution time	Memory
965627		phoenix0423	Garden (JOI23_garden)	C++17	45 / 100	3040 ms	195432 KiB

garden

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
#define fastio ios::sync_with_stdio(false), cin.tie(0)
#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx2")
#define pb push_back
#define eb emplace_back
#define f first
#define s second
// #define int long long
#define lowbit(x) x&-x
const int maxn = 5000 + 5;
const int INF = 1e18;
int a[maxn][maxn], dp[maxn][maxn], h[maxn], c[maxn], mx[maxn * 2], st[maxn * 2];

signed main(void){
    fastio;
    int n, m, d;
    cin>>n>>m>>d;
    set<int> cx, cy;
    for(int i = 0; i < n; i++){
        int x, y;
        cin>>x>>y;
        cx.insert(x), cy.insert(y);
        h[x] |= 1;
        c[y] |= 1;
    }
    for(int i = 0; i < m; i++){
        int x, y;
        cin>>x>>y;
        a[x][y] = 2;
    }
    auto cal = [&](int x, int y) -> int {
        if(x <= 0 || y <= 0) return 0;
        // cout<<"cal : "<<x<<" "<<y<<"\n";
        y = min(y, d - 1);
        x = min(x, d - 1);
        return (x + y) * d - x * y;
    };
    int ans = 0;
    for(int j = 2 * d - 1; j >= 0; j--){
        int tj = j;
        if(j >= d) j -= d;
        if(c[j]){
            j = tj;
            continue;
        }
        for(int i = 0; i < d; i++){
            if(h[i] || a[i][j]) continue;
            int nxt = j == d - 1 ? 0 : j + 1;
            dp[i][j] = dp[i][nxt] + 1;
            // cout<<"ok : "<<i<<" "<<j<<" "<<dp[i][j]<<"\n";
        }
        int top = 0;
        for(int i = 0; i < 2 * d; i++){
            while(top && dp[st[top] - (st[top] >= d ? d : 0)][j] > dp[i - (i >= d ? d : 0)][j]){
                int id = st[top] - (st[top] >= d ? d : 0), org = st[top]; top--;
                ans = max(ans, cal(dp[id][j], mx[org] + (i - org) - 1));
            }
            mx[i] = (top ? i - st[top] : i + 1);
            st[++top] = i;
        }
        while(top){
            // cout<<"put : "<<st.back() - (st.back() >= d) * d<<"\n";
            ans = max(ans, cal(dp[st[top] - (st[top] >= d ? d : 0)][j], mx[st[top]] + 2 * d - st[top] - 1));
            top--;
        }
        j = tj;
    }
    ans = d * d - ans;
    int cur = *(cx.rbegin()) + 1;
    int id = 0;
    for(int i = 0; i < d; i++){
        ans = min(ans, d * cur);
        if(!cx.count(i)) cur--;
        else cur = d;
    }
    cur = *(cy.rbegin()) + 1;
    for(int i = 0; i < d; i++){
        ans = min(ans, d * cur);
        if(!cy.count(i)) cur--;
        else cur = d;
    }
    ans = min(ans, d * cur);
    cout<<ans<<"\n";
}

Compilation message (stderr)

garden.cpp:15:17: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+18' to '2147483647' [-Woverflow]
   15 | const int INF = 1e18;
      |                 ^~~~
garden.cpp: In function 'int main()':
garden.cpp:74:9: warning: unused variable 'id' [-Wunused-variable]
   74 |     int id = 0;
      |         ^~

• Subtask 1: 15 / 15
• Subtask 2: 6 / 6
• Subtask 3: 8 / 8
• Subtask 4: 16 / 16
• Subtask 5: 0 / 30
• Subtask 6: 0 / 25