Submission #799666

#	Time	Username	Problem	Language	Result	Execution time	Memory
799666		Boomyday	Sails (IOI07_sails)	C++17	100 / 100	118 ms	13504 KiB

sails

//
// Created by adavy on 2/11/2023.
//
#include <bits/stdc++.h>
#include <ext/pb_ds/detail/standard_policies.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

typedef tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

using ll = long long;
using ld = long double;
using db = double;
using str = string; // yay python!

using ii = pair<int,int>;
using pl = pair<ll,ll>;
using pd = pair<db,db>;

using vi = vector<int>;
using vb = vector<bool>;
using vl = vector<ll>;
using vd = vector<db>;
using vs = vector<str>;
using vii = vector<ii>;
using vpl = vector<pl>;
using vpd = vector<pd>;

#define tcT template<class T
#define tcTU tcT, class U

tcT> using V = vector<T>;
tcT, size_t SZ> using AR = array<T,SZ>;
tcT> using PR = pair<T,T>;

// pairs
#define mp make_pair
#define f first
#define s second

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)

#define len(x) int((x).size())
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define sor(x) sort(all(x))
#define rsz resize
#define ins insert
#define ft front()
#define bk back()
#define pb push_back
#define eb emplace_back
#define pf push_front

const int MOD = 1e9+7; // 998244353;
const int MX = 2e5+5;
const ll INF = 1e18; // not too close to LLONG_MAX
const ld PI = acos((ld)-1);
const int dx[4] = {1,0,-1,0}, dy[4] = {0,1,0,-1}; // for every grid problem!!


int main(){
    std::ios::sync_with_stdio(false); cin.tie(NULL);
    int N; cin >> N;
    vii fls(N); // height, number of sails
    for(auto&[a,b]:fls){
        cin >> a >> b;
    }
    sort(all(fls));
    multiset<int> brksu = {0};
    multiset<int, greater<int>> brksl = {0};

    for(auto&[H,K]:fls){
        brksu.insert(0); brksl.insert(0);
        int hi = H, lo = H-K;
        if (brksu.find(lo) == brksu.end()){
            brksu.insert(hi); brksl.insert(hi);
            //trav(i, brksu) cout << i << " ";
            //cout << "brks" <<  endl;
           auto lb=*brksl.lower_bound(lo), ub = *brksu.upper_bound(lo);
           //cout << lb << " " << ub << hi << lo << endl;
           brksu.erase(brksu.find(ub));
           brksu.erase(brksu.find(lb));
           brksu.insert(lb + (K - (hi-ub)));
            brksl.erase(brksl.find(ub));
            brksl.erase(brksl.find(lb));
            brksl.insert(lb + (K - (hi-ub)));
        }
        else {
            // this is the good case
            brksu.insert(hi);
            brksu.erase(brksu.find(lo));
            brksl.insert(hi);
            brksl.erase(brksl.find(lo));
        }

        //trav(i, brksu) cout << i << " ";
        //cout << "brks" <<  endl;
    }
    //cout << "FOOBAR" << endl;
    vl anses(100010, 0);

    trav(i, brksu){
        anses[0]++;
        anses[i]--;
    }
    //cout << "FOOBAR" << endl;
    vl anses2 = {0};
    trav(i, anses){
        anses2.pb(anses2.back()+i);
    }
    ll ans=0;
    trav(i, anses2){
        ans+=((i)*(i-1))/2;
    }
    cout << ans << endl;
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10
• Subtask 11: 10 / 10