Submission #97411

#	Time	Username	Problem	Language	Result	Execution time	Memory
97411		silxikys	Exhibition (JOI19_ho_t2)	C++14	0 / 100	3 ms	384 KiB

joi2019_ho_t2

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

const int maxn = 1e5+5;
int N, M;
int frames[maxn];
int dp[maxn];

int main()
{
    cin >> N >> M;
    vector<pair<int,int>> pictures;
    for (int i = 0; i < N; i++) {
        int a, b; cin >> a >> b;
        pictures.push_back({a,b});
    }
    //coordinate compress values
    sort(pictures.begin(),pictures.end(),[](auto a, auto b) {
            return a.second < b.second;
            });
    map<int,int> comp;
    int c = 1;
    for (auto& p: pictures) {
        if (comp.count(p.second)) p.second = comp[p.second];
        else p.second = comp[p.second] = c++;
    }
    sort(pictures.begin(),pictures.end());
    for (int i = 1; i <= M; i++) cin >> frames[i];
    sort(frames+1,frames+M+1);

    int framePtr = M; //points to one-less-than smallest frame that >= current sz
    int ans = 0;            
    for (int i = N - 1; i >= 0; i--) {
        int sz = pictures[i].first;
        int val = pictures[i].second;
        while (frames[framePtr] >= sz) {
            framePtr--;
            if (framePtr == 0) break;    
        }
        if (framePtr + 1 == M + 1 || frames[framePtr+1] < sz) continue;
        //cout << sz << ": " << framePtr + 1 << ' ' << frames[framePtr+1] << '\n';
        int b = M - framePtr;
        //cout << i << ": " << b << '\n';
        dp[i] = 1;
        for (int j = i + 1; j < N; j++) {
            if (pictures[j].second >= val && dp[j] <= b - 1) {
                dp[i] = min(max(dp[i],min(b-1,dp[j]) + 1),M);
            }
        }
        //cout << i << ": " << dp[i] << '\n';
        ans = max(ans,dp[i]);
    }
    cout << ans << '\n';
}

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