Submission #920376

#	Time	Username	Problem	Language	Result	Execution time	Memory
920376		hasuhasuiro	Autobahn (COI21_autobahn)	C++17	0 / 100	1 ms	348 KiB

autobahn

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

int main() {
    int N, K, X;
    cin >> N >> K >> X;
    vector l(N, 0), r(N, 0), t(N, 0);
    for(int i = 0; i < N; i++) { cin >> l[i] >> t[i] >> r[i]; r[i]++; }
    vector P(0, 0);
    for(int i = 0; i < N; i++) { P.push_back(l[i]), P.push_back(r[i]), P.push_back(l[i]+t[i]); }
    int sizep(size(P));
    for(int i = 0; i < sizep; i++) { P.push_back(P[i]+X), P.push_back(P[i]-X); }
    sort(begin(P), end(P));
    P.erase(unique(begin(P), end(P)), end(P));

    /*
    for(int i = 0; i < size(P); i++) {
        cout << ' ' << P[i];
    }
    cout << endl;
    */

    map<int, int> mp;
    for(int i = 0; i < size(P); i++) { mp[P[i]] = i; }
    vector imos(size(P), 0);
    for(int i = 0; i < N; i++) { imos[mp[l[i]]]++; imos[mp[r[i]]]--; }
    for(int i = 0; i < size(P)-1; i++) { imos[i+1] += imos[i]; }

    vector imos2(size(P), 0);
    for(int i = 0; i < N; i++) { imos2[mp[l[i]+t[i]]]++; imos2[mp[r[i]]]--; }
    for(int i = 0; i < size(P)-1; i++) { imos2[i+1] += imos2[i]; }
    for(int i = 0; i < size(P); i++) { if(imos[i] < K) { imos2[i] = 0; } }

    /*
    for(int i = 0; i < size(P); i++) {
        cout << ' ' << imos2[i];
    }
    cout << endl;
    */

    int ans(0), res(0);
    for(int i = 0, j = 0; i+1 < size(P); i++) {
        for(; j+1 < size(P); j++) {
            if(P[i]+X <= P[j]) break;
            else res += imos2[mp[P[j]]] * (P[j+1]-P[j]);
        }
        /* cout << res << ' ' << P[i] << ' ' << P[j] << endl; */
        ans = max(res, ans);
        res -= imos2[mp[P[i]]] * (P[i+1] - P[i]);
    }
    cout << ans << endl;
    return 0;
}

Compilation message (stderr)

autobahn.cpp: In function 'int main()':
autobahn.cpp:24:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for(int i = 0; i < size(P); i++) { mp[P[i]] = i; }
      |                    ~~^~~~~~~~~
autobahn.cpp:27:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for(int i = 0; i < size(P)-1; i++) { imos[i+1] += imos[i]; }
      |                    ~~^~~~~~~~~~~
autobahn.cpp:31:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |     for(int i = 0; i < size(P)-1; i++) { imos2[i+1] += imos2[i]; }
      |                    ~~^~~~~~~~~~~
autobahn.cpp:32:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for(int i = 0; i < size(P); i++) { if(imos[i] < K) { imos2[i] = 0; } }
      |                    ~~^~~~~~~~~
autobahn.cpp:42:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     for(int i = 0, j = 0; i+1 < size(P); i++) {
      |                           ~~~~^~~~~~~~~
autobahn.cpp:43:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |         for(; j+1 < size(P); j++) {
      |               ~~~~^~~~~~~~~

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