Submission #569958

#	Time	Username	Problem	Language	Result	Execution time	Memory
569958		jcelin	Autobahn (COI21_autobahn)	C++14	50 / 100	1097 ms	171700 KiB

autobahn

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


typedef long long ll;
typedef long double ld;
typedef unsigned int ui;

#define ii pair<int,int>
#define pll pair<ll,ll>
#define vi vector<int>
#define vii vector<ii>
#define vll vector<ll>
#define vpll vector<pll>
#define matrix vector<vi>
#define matrixLL vector<vLL>
#define vs vector<string>
#define vui vector<ui>
#define msi multiset<int>
#define mss multiset<string>
#define si set<int>
#define ss set<string>
#define PB push_back
#define PF push_front
#define PPB pop_back
#define PPF pop_front
#define X first
#define Y second
#define MP make_pair
#define FOR(i, a, b) for (int i = int(a); i < int(b); i++)
#define REP(i, n) FOR(i, 0, n)
#define all(x) (x).begin(), (x).end()

const int dx[] = {-1, 1, 0, 0};
const int dy[] = {0, 0, -1, 1};
const int dxx[] = {-1, 1, 0, 0, 1, 1, -1, -1};
const int dyy[] = {0, 0, -1, 1, -1, 1, -1, 1};
const string abc="abcdefghijklmnopqrstuvwxyz";
const string ABC="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const ld pi = 3.14159265;
const int mod = 1e9 + 7;
const int MOD = 1e9 + 7;
const int MAXN = 1e6 + 7;
const int inf = mod;
const ll INF = 1e18;
const ll zero = ll(0);
const int logo = 20;
const int off = 1 << logo;
const int trsz = off << 1;

ll n, k, x;
map<int, ll> pref, in, out, skok;
map<int, bool> good;
ll ans = -1;
vi vec;
 
void solve(){
    cin >> n >> k >> x;
    pref[0] = 0;
    for(int i=1; i<=n; i++){
        int l, t, r;
        cin >> l >> t >> r;
 
        vec.PB(l);
        vec.PB(l + t);
        vec.PB(r);
        
        if(l - x >= 1) vec.PB(l - x);
        if(l + t - x >= 1) vec.PB(l + t - x);
        if(r - x >= 1) vec.PB(r - x);
        
        in[l]++; 
		out[r]++;
        skok[l + t]++;
        good[l] = 1; 
		good[l + t] = 1; 
		good[r] = 1;
    }
 
    sort(all(vec));
 
    vec.erase(unique(all(vec)), vec.end());
 
    ll cnt = 0, sum = 0, cur = 0, lst = -1;
 
    for(const auto &i : vec){
        if(cnt >= k and lst != -1) sum += (ll)(i - lst - 1) * (ll)cur;
        cnt += in[i];
        cur += skok[i];
        if(cnt >= k) sum += cur;
        
        cnt -= out[i];
        cur -= out[i];
        pref[i] = sum;
        lst = i;
    }
 
    for(const auto &i : vec){
        if(!good[i]) continue;
        if(i - x >= 0) ans = max(ans, pref[i] - pref[i - x]);
    }
    cout << ans << "\n";
}


int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int t=1;
	//cin >> t;
	while(t--)solve();
	return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 0 / 50