Submission #1046060

#	Time	Username	Problem	Language	Result	Execution time	Memory
1046060		Zicrus	Teleporters (IOI08_teleporters)	C++17	55 / 100	1095 ms	65536 KiB

teleporters

#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

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

typedef long long ll;

ll n, m;
vector<ll> a;
vector<bool> vst;

void simulateVst(vector<ll> &a) {
    ll i = 0;
    while (i < a.size()) {
        i = a[i];
        vst[i] = true;
        i++;
    }
}

ll simulate(vector<ll> &a) {
    ll res = 0;
    ll i = 0;
    while (i < a.size()) {
        i = a[i];
        i++;
        res++;
    }
    return res;
}

int main() {
    ios::sync_with_stdio(0);

    cin >> n >> m;
    vector<pair<ll, ll>> tp;
    for (int i = 0; i < n; i++) {
        ll x, y;
        cin >> x >> y;
        tp.push_back({x, y});
        tp.push_back({y, x});
    }
    sort(tp.begin(), tp.end());

    unordered_map<ll, ll> ids;
    for (int i = 0; i < 2*n; i++) {
        ids[tp[i].first] = i;
    }
    a = vector<ll>(2*n);
    for (int i = 0; i < 2*n; i++) {
        a[i] = ids[tp[i].second];
    }

    ll mx = simulate(a);
    while (m--) {
        vst = vector<bool>(a.size());
        simulateVst(a);
        vector<ll> mxA = a;
        mxA.push_back(mxA.size()+1);
        mxA.push_back(mxA.size()-1);
        mx = simulate(mxA);
        for (int i = 0; i < a.size(); i++) {
            if (a[i] < i || vst[i]) continue;
            vector<ll> nw;
            for (int j = 0; j < a.size(); j++) {
                if (j == i) {
                    nw.push_back(i+2);
                    nw.push_back(a[i]+2);
                    nw.push_back(i);
                    continue;
                }
                if (a[j] == i) nw.push_back(i+1);
                else nw.push_back(a[j] > i ? a[j]+2 : a[j]);
            }
            ll val = simulate(nw);
            if (val > mx) {
                mx = val;
                mxA = nw;
            }
        }
        a = mxA;
    }

    cout << mx;
}

Compilation message (stderr)

teleporters.cpp: In function 'void simulateVst(std::vector<long long int>&)':
teleporters.cpp:15:14: 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]
   15 |     while (i < a.size()) {
      |            ~~^~~~~~~~~~
teleporters.cpp: In function 'll simulate(std::vector<long long int>&)':
teleporters.cpp:25:14: 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]
   25 |     while (i < a.size()) {
      |            ~~^~~~~~~~~~
teleporters.cpp: In function 'int main()':
teleporters.cpp:63:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |         for (int i = 0; i < a.size(); i++) {
      |                         ~~^~~~~~~~~~
teleporters.cpp:66:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |             for (int j = 0; j < a.size(); j++) {
      |                             ~~^~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 5 / 5
• Subtask 7: 5 / 5
• Subtask 8: 5 / 5
• Subtask 9: 5 / 5
• Subtask 10: 5 / 5
• Subtask 11: 5 / 5
• Subtask 12: 0 / 5
• Subtask 13: 0 / 5
• Subtask 14: 0 / 5
• Subtask 15: 0 / 5
• Subtask 16: 0 / 5
• Subtask 17: 0 / 5
• Subtask 18: 0 / 5
• Subtask 19: 0 / 5
• Subtask 20: 0 / 5