oj.uz

Submission #1056682

# Submission time Handle Problem Language Result Execution time Memory
1056682 2024-08-13T10:36:55 Z mc061 Longest Trip (IOI23_longesttrip) C++17
15 / 100
 12 ms 856 KB 
#include <bits/stdc++.h>
using namespace std;
 
vector<int> path;
vector<int> mxpath;
int n;
set<int> have;
 
const int maxN = 256;
bool connected[maxN][maxN]={};
bool ans[maxN][maxN]={};
 
bool are_connected(vector<int> A, vector<int> B);
 
void dfs(int v) {
    path.push_back(v);
    have.insert(v);
    if (path.size() == n) {
        return;
    }
    vector<int> ord(n);
    iota(ord.begin(), ord.end(), 0);
    random_shuffle(ord.begin(), ord.end());
    for (int i : ord) {
        if (!have.count(i)) {
            bool c = false;
            if (ans[v][i]) {
                c = connected[v][i];
            }
            else {
                ans[v][i] = ans[i][v] = true;
                bool x = are_connected(vector<int>{i}, vector<int>{v});
                connected[v][i] = connected[i][v] = x;
                c = x;
            }
            if (c)
                dfs(i);
        }
        if (path.size() == n) return;
    }
    if (path.size() == n) return;
    if (path.size() > mxpath.size()) {
        mxpath = path;
    }
    path.pop_back();
    have.erase(v);
}
 
vector<int> longest_trip(int N, int D) {
    for (int i = 0; i < N; ++i) {
        for (int j = 0; j < N; ++j) {
            connected[i][j] = false;
            ans[i][j] = false;
        }
    }
    n = N;
    int start = 0;
    path.clear();
    have.clear();
    vector<int> o(n);
    iota(o.begin(), o.end(), 0);
    random_shuffle(o.begin(), o.end());
    for (int i = 0; i < min(n, 30); ++i) {
        path.clear();
        have.clear();
        dfs(o[i]);
        if (path.size() == n) return path;
    }
    return mxpath.size() > path.size() ? mxpath : path;
}

Compilation message

longesttrip.cpp: In function 'void dfs(int)':
longesttrip.cpp:18:21: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   18 |     if (path.size() == n) {
      |         ~~~~~~~~~~~~^~~~
longesttrip.cpp:39:25: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   39 |         if (path.size() == n) return;
      |             ~~~~~~~~~~~~^~~~
longesttrip.cpp:41:21: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   41 |     if (path.size() == n) return;
      |         ~~~~~~~~~~~~^~~~
longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:67:25: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   67 |         if (path.size() == n) return path;
      |             ~~~~~~~~~~~~^~~~
longesttrip.cpp:57:9: warning: unused variable 'start' [-Wunused-variable]
   57 |     int start = 0;
      |         ^~~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 2 ms 856 KB Output is correct

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 5 ms 344 KB Output is correct
4 Correct 5 ms 344 KB Output is correct
5 Correct 7 ms 856 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 5 ms 344 KB Output is correct
4 Correct 6 ms 344 KB Output is correct
5 Correct 7 ms 856 KB Output is correct
6 Correct 5 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 6 ms 344 KB Output is correct
10 Correct 7 ms 784 KB Output is correct
11 Correct 7 ms 856 KB Output is correct
12 Correct 11 ms 856 KB Output is correct
13 Correct 7 ms 856 KB Output is correct

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 344 KB Output is correct
2 Correct 4 ms 344 KB Output is correct
3 Correct 6 ms 344 KB Output is correct
4 Correct 6 ms 344 KB Output is correct
5 Correct 9 ms 856 KB Output is correct
6 Correct 8 ms 344 KB Output is correct
7 Correct 6 ms 344 KB Output is correct
8 Correct 5 ms 344 KB Output is correct
9 Correct 5 ms 344 KB Output is correct
10 Correct 7 ms 856 KB Output is correct
11 Correct 7 ms 856 KB Output is correct
12 Correct 9 ms 756 KB Output is correct
13 Correct 10 ms 828 KB Output is correct
14 Incorrect 0 ms 344 KB Incorrect
15 Halted 0 ms 0 KB -

Subtask #4
0.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 344 KB Output is correct
2 Correct 7 ms 344 KB Output is correct
3 Correct 6 ms 344 KB Output is correct
4 Correct 6 ms 344 KB Output is correct
5 Correct 7 ms 856 KB Output is correct
6 Correct 5 ms 344 KB Output is correct
7 Correct 5 ms 344 KB Output is correct
8 Correct 6 ms 344 KB Output is correct
9 Correct 7 ms 344 KB Output is correct
10 Correct 12 ms 856 KB Output is correct
11 Correct 12 ms 856 KB Output is correct
12 Correct 12 ms 856 KB Output is correct
13 Correct 7 ms 856 KB Output is correct
14 Incorrect 0 ms 344 KB Incorrect
15 Halted 0 ms 0 KB -