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Submission #1074191

# Submission time Handle Problem Language Result Execution time Memory
1074191 2024-08-25T08:44:13 Z anango Longest Trip (IOI23_longesttrip) C++17
15 / 100
 13 ms 600 KB 
#include "longesttrip.h"
#include <bits/stdc++.h>
using namespace std;

int n;
bool are_connected_valid(vector<int> S, vector<int> T) {
    sort(S.begin(), S.end());
    sort(T.begin(), T.end());
    //assert(S.size()>0);
    //assert(T.size()>0);
    if (S.size()==0 || T.size()==0) {
        return 0;
    }
    return are_connected(S,T);
}

vector<int> longest_trip(int N, int D) {
    n=N;
    deque<int> path1;
    deque<int> path2;
    path1.push_back(0);
    path2.push_back(1);
    for (int i=2; i<n; i++) {
        if (are_connected_valid({path1.back()},{i})) {
            path1.push_back(i);
        }
        else if (are_connected_valid({path2.back()},{i})) {
            path2.push_back(i);
        }
        else {
            //path1's end is connected to path2's end
            while (path2.size()) {
                path1.push_back(path2.back());
                path2.pop_back();
            }
            path2={i};
        }
    }
    vector<int> grp1(path1.begin(), path1.end());
    vector<int> grp2(path2.begin(), path2.end());
    //cout << "JAMBLOAT" <<  " " << grp1.size() <<" " << grp2.size() << endl;
    if (grp1.size()<grp2.size()) {
        swap(grp1,grp2);
    }
    if (grp1.size()==0 || grp2.size()==0 || !are_connected_valid(grp1,grp2)) {
        return grp1;
    }
    vector<int> end1 = {grp1.front(), grp1.back()};
    vector<int> end2 = {grp2.front(), grp2.back()};
    end1.erase(unique(end1.begin(), end1.end()),end1.end());
    end2.erase(unique(end2.begin(), end2.end()),end2.end());
    if (are_connected_valid(end1,end2)) {
        if (are_connected_valid({grp1.front()},{grp2.front()})) {
            vector<int> con;
            for (auto i:grp1) {
                con.push_back(i);
            }
            reverse(con.begin(), con.end());
            for (auto i:grp2) {
                con.push_back(i);
            }
            return con; //length n
        }
        if (are_connected_valid({grp1.front()},{grp2.back()})) {
            vector<int> con;
            for (auto i:grp1) {
                con.push_back(i);
            }
            reverse(con.begin(), con.end());
            reverse(grp2.begin(), grp2.end());
            for (auto i:grp2) {
                con.push_back(i);
            }
            return con; //length n
        }
        if (are_connected_valid({grp1.back()},{grp2.front()})) {
            vector<int> con;
            for (auto i:grp1) {
                con.push_back(i);
            }
            for (auto i:grp2) {
                con.push_back(i);
            }
            return con; //length n
        }
        if (are_connected_valid({grp1.back()},{grp2.back()})) {
            vector<int> con;
            for (auto i:grp1) {
                con.push_back(i);
            }
            reverse(grp2.begin(), grp2.end());
            for (auto i:grp2) {
                con.push_back(i);
            }
            return con; //length n
        }
    }

    int l = 0;
    int r = grp1.size(); r--;
    while (l<r) {
        int m = (l+r)/2;
        vector<int> part(grp1.begin(), grp1.begin()+m);
        if (are_connected_valid(part,grp2)) {
            r=m;
        }
        else {
            l=m+1;
        }
    }
    int x1 = l;
    l = 0;
    r = grp2.size(); r--;
    assert(are_connected_valid({grp1[x1]},grp2));
    while (l<r) {
        int m = (l+r)/2;
        vector<int> part(grp2.begin(), grp2.begin()+m);
        if (are_connected_valid({grp1[x1]},part)) {
            r=m;
        }
        else {
            l=m+1;
        }
    }
    int x2 = l;
    vector<int> ans;
    for (int i=x1+1; i<grp1.size(); i++) {
        ans.push_back(grp1[i]);
    }
    for (int i=0; i<=x1; i++) {
        ans.push_back(grp1[i]);
    }
    for (int i=x2; i<grp2.size(); i++) {
        ans.push_back(grp2[i]);
    }
    for (int i=0; i<x2; i++) {
        ans.push_back(grp2[i]);
    }
    return ans;
}

Compilation message

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:127:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  127 |     for (int i=x1+1; i<grp1.size(); i++) {
      |                      ~^~~~~~~~~~~~
longesttrip.cpp:133:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  133 |     for (int i=x2; i<grp2.size(); i++) {
      |                    ~^~~~~~~~~~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 2 ms 344 KB Output is correct

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 344 KB Output is correct
2 Correct 5 ms 344 KB Output is correct
3 Correct 4 ms 344 KB Output is correct
4 Correct 6 ms 344 KB Output is correct
5 Correct 5 ms 600 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 344 KB Output is correct
2 Correct 8 ms 344 KB Output is correct
3 Correct 6 ms 344 KB Output is correct
4 Correct 5 ms 344 KB Output is correct
5 Correct 5 ms 344 KB Output is correct
6 Correct 10 ms 344 KB Output is correct
7 Correct 5 ms 344 KB Output is correct
8 Correct 8 ms 344 KB Output is correct
9 Correct 8 ms 344 KB Output is correct
10 Correct 7 ms 344 KB Output is correct
11 Correct 5 ms 344 KB Output is correct
12 Correct 6 ms 344 KB Output is correct
13 Correct 7 ms 344 KB Output is correct

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 344 KB Output is correct
2 Correct 5 ms 344 KB Output is correct
3 Correct 7 ms 344 KB Output is correct
4 Correct 4 ms 344 KB Output is correct
5 Correct 6 ms 344 KB Output is correct
6 Correct 8 ms 344 KB Output is correct
7 Correct 6 ms 344 KB Output is correct
8 Correct 4 ms 344 KB Output is correct
9 Correct 5 ms 344 KB Output is correct
10 Correct 8 ms 344 KB Output is correct
11 Correct 6 ms 344 KB Output is correct
12 Correct 7 ms 344 KB Output is correct
13 Correct 5 ms 344 KB Output is correct
14 Correct 9 ms 344 KB Output is correct
15 Correct 10 ms 344 KB Output is correct
16 Incorrect 2 ms 344 KB Incorrect
17 Halted 0 ms 0 KB -

Subtask #4
0.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 344 KB Output is correct
2 Correct 10 ms 344 KB Output is correct
3 Correct 6 ms 344 KB Output is correct
4 Correct 5 ms 344 KB Output is correct
5 Correct 5 ms 344 KB Output is correct
6 Correct 10 ms 344 KB Output is correct
7 Correct 9 ms 344 KB Output is correct
8 Correct 5 ms 340 KB Output is correct
9 Correct 8 ms 344 KB Output is correct
10 Correct 5 ms 436 KB Output is correct
11 Correct 8 ms 344 KB Output is correct
12 Correct 8 ms 344 KB Output is correct
13 Correct 5 ms 344 KB Output is correct
14 Correct 6 ms 344 KB Output is correct
15 Correct 5 ms 344 KB Output is correct
16 Incorrect 1 ms 344 KB Incorrect
17 Halted 0 ms 0 KB -