Submission #424492

#	Time	Username	Problem	Language	Result	Execution time	Memory
424492		zoooma13	Financial Report (JOI21_financial)	C++14	100 / 100	799 ms	45972 KiB

Main

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

struct pref : set <pair<int ,int>>{
    void add(int i ,int v){
        auto it = insert({i ,v}).first;
        if(it != begin() && prev(it)->second >= it->second){
            erase(it);
            return;
        }
        while(next(it) != end() && next(it)->second <= it->second)
            erase(next(it));
    }
    int qry(int i){
        auto it = upper_bound({i ,-1});
        if(it == begin())
            return 0;
        return prev(it)->second;
    }
};

vector <int> par;
vector <pref> trac;
int fnd(int u){
    return par[u] == u? u : par[u] = fnd(par[u]);
}
int unn(int u ,int v){
    u = fnd(u) ,v = fnd(v);
    if(u == v)
        return v;
    if(trac[u].size() > trac[v].size())
        swap(u ,v);
    par[u] = v;
    for(auto s : trac[u])
        trac[v].add(s.first ,s.second);
    trac[u].clear();
    return v;
}

int main()
{
    int n ,d;
    scanf("%d%d",&n,&d);
    vector <int> a(n);
    for(int&i : a)
        scanf("%d",&i);

    vector <int> ord;
    for(int i = 0; i < n; i++){
        ord.push_back(i);
        par.push_back(i);
        trac.push_back({});
        trac.back().add(i ,1);
    }
    sort(ord.begin() ,ord.end() ,[&](int&i ,int&j){
        return a[i] == a[j]? i > j : a[i] < a[j];
    });

    set <int> added;
    for(int&i : ord){
        auto it = added.insert(i).first;
        if(it != added.begin() && i - *prev(it) <= d){
            trac[i].clear();
            par[i] = fnd(*prev(it));
            trac[par[i]].add(i ,trac[par[i]].qry(i)+1);
        }
        if(next(it) != added.end() && *next(it) - i <= d)
            unn(i ,*next(it));
    }
    printf("%d\n",trac[fnd(0)].qry(n));
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:43:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |     scanf("%d%d",&n,&d);
      |     ~~~~~^~~~~~~~~~~~~~
Main.cpp:46:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |         scanf("%d",&i);
      |         ~~~~~^~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 20 / 20
• Subtask 4: 12 / 12
• Subtask 5: 5 / 5
• Subtask 6: 35 / 35