Submission #1049158

#	Time	Username	Problem	Language	Result	Execution time	Memory
1049158		Zicrus	Overtaking (IOI23_overtaking)	C++17	100 / 100	1781 ms	74436 KiB

overtaking

#include <bits/stdc++.h>
#include "overtaking.h"
using namespace std;
 
typedef long long ll;
 
vector<vector<ll>> tCur, tNxt;
vector<ll> s;
ll x, m;
 
void init(int l1, int n1, vector<ll> t, vector<int> w, int x1, int m1, vector<int> s1) {
    {
        ll l = l1;
        ll n = n1;
        s = vector<ll>(s1.size());
        for (ll i = 0; i < s1.size(); i++) s[i] = s1[i];
        m = m1;
        x = x1;
        tCur = vector<vector<ll>>(m-1);
        tNxt = vector<vector<ll>>(m-1);
        vector<pair<ll, ll>> busses;
        for (ll i = 0; i < n; i++) {
            if (w[i] <= x) continue;
            busses.push_back({t[i], w[i]});
        }
        sort(busses.begin(), busses.end());
        n = busses.size();
    
        for (ll t = 0; t < m-1; t++) {
            for (ll i = 0; i < n; i++) {
                ll curTime = busses[i].first;
                if (t > 0) {
                    ll idealNxt = curTime + busses[i].second * (s[t] - s[t-1]);
                    auto iter = lower_bound(tCur[t-1].begin(), tCur[t-1].end(), curTime);
                    ll id = iter - tCur[t-1].begin();
                    ll mxNxt = id > 0 ? tNxt[t-1][id-1] : 0;
                    busses[i].first = curTime = max(idealNxt, mxNxt);
                }
                ll idealNxt = curTime + busses[i].second * (s[t+1] - s[t]);
                auto iter = lower_bound(tCur[t].begin(), tCur[t].end(), curTime);
                ll id = iter - tCur[t].begin();
                ll mxNxt = id > 0 ? tNxt[t][id-1] : 0;
                ll nxt = max(idealNxt, mxNxt);
                if (nxt > mxNxt) {
                    if (id < tCur[t].size() && curTime == tCur[t][id]) {
                        if (nxt > tNxt[t][id]) tNxt[t][id] = nxt;
                    }
                    else {
                        tCur[t].insert(iter, curTime);
                        tNxt[t].insert(tNxt[t].begin() + id, nxt);
                    }
                }
            }
        }
    }

    queue<ll> q, q1;
    vector<ll> tmpCur, tmpNxt;
    for (int t = m-3; t >= 0; t--) {
        if ((t+1) % 167 == 0) continue;

        tmpCur = tCur[t];
        tmpNxt = tNxt[t];
        tCur[t].clear(); tNxt[t].clear();
        for (int i = 0; i < tmpCur.size(); i++) {
            q.push(tmpCur[i]);
        }
        for (auto &e : tCur[t+1]) {
            q1.push(e - x * (s[t+1] - s[t]));
        }

        ll idA = 0, idB = 0;
        while (!q.empty() || !q1.empty()) {
            ll curTime = 0;
            if (q.empty()) {
                curTime = q1.front(); q1.pop();
            }
            else if (q1.empty()) {
                curTime = q.front(); q.pop();
            }
            else if (q.front() < q1.front()) {
                curTime = q.front(); q.pop();
            }
            else {
                curTime = q1.front(); q1.pop();
            }
            ll idealNxt = curTime + x * (s[t+1] - s[t]);
            while (idA < tmpCur.size() && tmpCur[idA] <= curTime) idA++;
            ll mxNxt = idA > 0 ? tmpNxt[idA-1] : 0;
            ll nxt = max(idealNxt, mxNxt);

            ll idealEnd = nxt + x * (s[t+2] - s[t+1]);
            if (idealNxt >= mxNxt) {
                while (idB < tCur[t+1].size() && tCur[t+1][idB] <= nxt) idB++;
            }
            else {
                while (idB < tCur[t+1].size() && tCur[t+1][idB] < nxt) idB++;
            }
            ll mxEnd = idB > 0 ? tNxt[t+1][idB-1] : 0;
            ll end = max(idealEnd, mxEnd);

            ll id = tCur[t].size() - 1;
            ll mxPre = tNxt[t].size() > 0 ? tNxt[t].back() : 0;

            if (end > mxPre) {
                if (curTime == tCur[t][id]) {
                    if (end > tNxt[t][id]) tNxt[t][id] = end;
                }
                else {
                    tCur[t].push_back(curTime);
                    tNxt[t].push_back(end);
                }
            }
        }

        tCur.erase(tCur.begin()+t+1);
        tNxt.erase(tNxt.begin()+t+1);
        s.erase(s.begin()+t+1);
    }
}

ll arrival_time(ll y) {
    for (int t = 0; t < s.size()-1; t++) {
        ll idealNxt = y + x * (s[t+1] - s[t]);
        ll id = lower_bound(tCur[t].begin(), tCur[t].end(), y) - tCur[t].begin();
        ll mxNxt = id > 0 ? tNxt[t][id-1] : 0;
        y = max(idealNxt, mxNxt);
    }
    return y;
}

Compilation message (stderr)

overtaking.cpp: In function 'void init(int, int, std::vector<long long int>, std::vector<int>, int, int, std::vector<int>)':
overtaking.cpp:16:26: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |         for (ll i = 0; i < s1.size(); i++) s[i] = s1[i];
      |                        ~~^~~~~~~~~~~
overtaking.cpp:45:28: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |                     if (id < tCur[t].size() && curTime == tCur[t][id]) {
      |                         ~~~^~~~~~~~~~~~~~~~
overtaking.cpp:13:12: warning: unused variable 'l' [-Wunused-variable]
   13 |         ll l = l1;
      |            ^
overtaking.cpp:65:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |         for (int i = 0; i < tmpCur.size(); i++) {
      |                         ~~^~~~~~~~~~~~~~~
overtaking.cpp:88:24: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   88 |             while (idA < tmpCur.size() && tmpCur[idA] <= curTime) idA++;
      |                    ~~~~^~~~~~~~~~~~~~~
overtaking.cpp:94:28: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   94 |                 while (idB < tCur[t+1].size() && tCur[t+1][idB] <= nxt) idB++;
      |                        ~~~~^~~~~~~~~~~~~~~~~~
overtaking.cpp:97:28: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   97 |                 while (idB < tCur[t+1].size() && tCur[t+1][idB] < nxt) idB++;
      |                        ~~~~^~~~~~~~~~~~~~~~~~
overtaking.cpp: In function 'll arrival_time(ll)':
overtaking.cpp:123:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  123 |     for (int t = 0; t < s.size()-1; t++) {
      |                     ~~^~~~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 20 / 20
• Subtask 4: 26 / 26
• Subtask 5: 35 / 35