Submission #1250234

#	Time	Username	Problem	Language	Result	Execution time	Memory
1250234		chithanhnguyen	World Map (IOI25_worldmap)	C++20	Compilation error	0 ms	0 KiB

worldmap

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

int n, m;
vector<int> euler_tour;
vector<int> span[45], adj[45];
bool vis[45], used[45];

void dfs(int u) {
    vis[u] = 1;
    
    for (int v : adj[u]) {
        if (!vis[v]) {
            span[u].push_back(v);
            span[v].push_back(u);
            dfs(v);
        }
    }
}

void dfs_euler(int u) {
    vis[u] = 1;
    euler_tour.push_back(u);
    
    for (int v : adj[u]) {
        if (!vis[v]) {
            dfs_euler(v);
            euler_tour.push_back(u);
        }
    }
}

vector<vector<int>> create_map(int N, int M, vector<int> A, vector<int> B) {
    euler_tour.clear();
    for (int i = 0; i < 45; ++i) adj[i].clear();
    for (int i = 0; i < 45; ++i) span[i].clear();
    memset(vis, 0, sizeof vis);

    n = N; m = M;
    for (int i = 0; i < m; ++i) {
        int u = A[i], v = B[i];
        adj[u].push_back(v);
        adj[v].push_back(u);
    }

    dfs(1);

    memset(vis, 0, sizeof vis);
    // for (int i = 1; i <= N; ++i) {
    //     cout << i << ": ";
    //     for (int j : span[i]) cout << j << " "; 
    //     cout << '\n';
    // }

    dfs_euler(1);
    // for (int v : euler_tour) cout << v << " ";
    // cout << '\n';

    vector<vector<int>> res(4*n, vector<int>(4*n, 0));
    memset(used, 0, sizeof used);
    int matsz = 4 * n, toursz = 2 * n - 1;

    int currow = 0;
    for (int i = 0; i < toursz; ++i) {
        for (int j = 0; j < matsz; ++j) res[currow][j] = euler_tour[i];
        ++currow;
        if (!used[euler_tour[i]]){
            // cout << "Need added at index: " << i << " with: ";
            for (int j = 0; j < matsz; ++j) res[currow + 1][j] = euler_tour[i];
            for (int j = 0; j < matsz; ++j) res[currow][j] = euler_tour[i];
            int curcol = 0;
            for (int v : adj[euler_tour[i]]) {
                res[currow][curcol] = v;
                res[currow][curcol + 1] = euler_tour[i];
                // cout << v << " ";
                curcol += 2;
            }
            // cout << '\n';
            currow += 2;
        }
        used[euler_tour[i]] = 1;
    }

    for (int i = 0; i < 4 * n; ++i) {
        for (int j = 0; j < 4 * n; ++j) {
            if (res[i][j] == 0) res[i][j] = 1;
        }
    }

    // for (int i = 0; i < 4 * n; ++i) {
    //     for (int j = 0; j < 4 * n; ++j) {
    //         cout << res[i][j] << " ";
    //     }
    //     cout << '\n';
    // }

    return res;
}


// int main() {
//     vector<vector<int>> res = create_map(4, 4, {1, 1, 2, 3}, {2, 3, 4, 4});
//     for (int i = 0; i < 4 * n ; ++i) {
//         for (int j = 0; j < 4 * n; ++j) {
//             cout << res[i][j] << " ";
//         }
//         cout << '\n';
//     }
// }

Compilation message (stderr)

worldmap.cpp: In function 'void dfs(int)':
worldmap.cpp:15:13: error: reference to 'span' is ambiguous
   15 |             span[u].push_back(v);
      |             ^~~~
In file included from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:147,
                 from worldmap.cpp:2:
/usr/include/c++/11/span:56:11: note: candidates are: 'template<class _Type, long unsigned int _Extent> class std::span'
   56 |     class span;
      |           ^~~~
worldmap.cpp:7:13: note:                 'std::vector<int> span [45]'
    7 | vector<int> span[45], adj[45];
      |             ^~~~
worldmap.cpp:16:13: error: reference to 'span' is ambiguous
   16 |             span[v].push_back(u);
      |             ^~~~
In file included from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:147,
                 from worldmap.cpp:2:
/usr/include/c++/11/span:56:11: note: candidates are: 'template<class _Type, long unsigned int _Extent> class std::span'
   56 |     class span;
      |           ^~~~
worldmap.cpp:7:13: note:                 'std::vector<int> span [45]'
    7 | vector<int> span[45], adj[45];
      |             ^~~~
worldmap.cpp: In function 'std::vector<std::vector<int> > create_map(int, int, std::vector<int>, std::vector<int>)':
worldmap.cpp:37:34: error: reference to 'span' is ambiguous
   37 |     for (int i = 0; i < 45; ++i) span[i].clear();
      |                                  ^~~~
In file included from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:147,
                 from worldmap.cpp:2:
/usr/include/c++/11/span:56:11: note: candidates are: 'template<class _Type, long unsigned int _Extent> class std::span'
   56 |     class span;
      |           ^~~~
worldmap.cpp:7:13: note:                 'std::vector<int> span [45]'
    7 | vector<int> span[45], adj[45];
      |             ^~~~