Submission #848632

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
848632	2023-09-13 06:18:56	piOOE	Longest Trip (IOI23_longesttrip)	C++17	100 / 100	22 ms	1108 KiB

longesttrip

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#include "longesttrip.h"
#include <bits/stdc++.h>
using namespace std;
std::vector<int> longest_trip(int N, int D) {
    mt19937 rnd(228);
    vector<int> a, b, ord(N);
    iota(ord.begin(), ord.end(), 0);
    shuffle(ord.begin(), ord.end(), rnd);
    int known = -1;
    for (int x : ord) {
        if (a.empty() || b.empty()) {
            (a.empty() ? a : b).push_back(x);
            continue;
        }
        if (rnd() % 2) {
            swap(a, b);
        }
        if (1) {
            int res = are_connected({a.back()}, {x});
            if (res == 1) {
                a.push_back(x);
                known = -1;
            } else if (known != -1) {
                if (known == 1) { // unreachable
                    a.insert(a.end(), b.rbegin(), b.rend());
                    b = {x};
 
 
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Compilation message (stderr)

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:70:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   70 |             int mid = lo + hi >> 1;
      |                       ~~~^~~~
longesttrip.cpp:93:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   93 |             int mid = lo + hi >> 1;
      |                       ~~~^~~~

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 60 / 60