Submission #1291071

#	Time	Username	Problem	Language	Result	Execution time	Memory
1291071		kubinsgk8	Exhibition (JOI19_ho_t2)	C++20	0 / 100	15 ms	34092 KiB

joi2019_ho_t2

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

const int N = 1e5 + 2;

struct Picture {
    long long size, value, val_idx;
};

long long n, m;
Picture pics[N];
long long frames[N];

bool compareByValue(Picture a, Picture b) {
    return a.value < b.value;
}

bool compareBySize(Picture a, Picture b) {
    return a.size < b.size;
}

namespace sub2 {
    const int MAX = 1002;
    long long segtree[MAX][4 * MAX];
    
    bool check() {
        return n <= 1000 && m <= 1000;
    }
    
    void update(int frame, int node, int l, int r, int idx, long long val) {
        if (l == r) {
            segtree[frame][node] = max(segtree[frame][node], val);
            return;
        }
        int mid = (l + r) / 2;
        if (idx <= mid) 
            update(frame, node * 2, l, mid, idx, val);
        else 
            update(frame, node * 2 + 1, mid + 1, r, idx, val);
        segtree[frame][node] = max(segtree[frame][node * 2], segtree[frame][node * 2 + 1]);
    }
    
    long long query(int frame, int node, int l, int r, int ql, int qr) {
        if (ql > qr) return 0;
        if (l > qr || r < ql) return 0;
        if (ql <= l && r <= qr) return segtree[frame][node];
        int mid = (l + r) / 2;
        return max(query(frame, node * 2, l, mid, ql, qr),
                   query(frame, node * 2 + 1, mid + 1, r, ql, qr));
    }
    
    void solve() {
        memset(segtree, 0, sizeof segtree);
        
        // Create a copy sorted by value for processing
        Picture byValue[N];
        for (int i = 1; i <= n; i++) byValue[i] = pics[i];
        sort(byValue + 1, byValue + n + 1, compareByValue);
        
        // Map each picture to its value index
        map<pair<long long, long long>, int> val_idx_map;
        for (int i = 1; i <= n; i++) {
            val_idx_map[{byValue[i].size, byValue[i].value}] = i;
        }
        
        // Assign value indices to original pictures
        for (int i = 1; i <= n; i++) {
            pics[i].val_idx = val_idx_map[{pics[i].size, pics[i].value}];
        }
        
        long long ans = 0;
        
        // Process pictures in SIZE order (as before)
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= m; j++) {
                if (pics[i].size <= frames[j]) {
                    long long best_prev = 0;
                    // Look in ALL previous frames (0 to j) for pictures with smaller value index
                    for (int k = 0; k <= j; k++) {
                        if (pics[i].val_idx > 1) {
                            best_prev = max(best_prev, query(k, 1, 1, n, 1, pics[i].val_idx - 1));
                        }
                    }
                    long long new_val = best_prev + 1;
                    update(j, 1, 1, n, pics[i].val_idx, new_val);
                    ans = max(ans, new_val);
                }
            }
        }
        
        cout << ans;
    }
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n >> m;
    
    for (int i = 1; i <= n; i++) {
        cin >> pics[i].size >> pics[i].value;
    }
    
    for (int i = 1; i <= m; i++) {
        cin >> frames[i];
    }
    
    sort(frames + 1, frames + m + 1);
    sort(pics + 1, pics + n + 1, compareBySize);
    
    if (sub2::check()) {
        sub2::solve();
    }
    
    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 40
• Subtask 3: 0 / 50