Submission #1338808

#	Time	Username	Problem	Language	Result	Execution time	Memory
1338808		po_rag526	Shops (NOI24_shops)	C++20	0 / 100	151 ms	30228 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define ii pair <int, int>
#define X first
#define Y second
const int maxn = 5e5 + 5;
int n, m, ans = 0, vis[maxn];
stack <int> q;
vector <ii> adj[maxn];
void bfs (int start) {
    q.push (start);
    vis[start] = 1;
    while (!q.empty()) {
        int u = q.top();
        q.pop();
        int res = 1e9;
        for (auto [v, w] : adj[u]) {
            if (vis[v] == 0) {
                vis[v] = 3 - vis[u];
                res = min (res, w);
                q.push (v);
            }
        }
        if (res != 1e9) ans = max (ans, res);
    }
}
signed main () {
    #define task "code"
    if (fopen (task".inp", "r")) {
        freopen (task".inp", "r", stdin);
        freopen (task".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> m;
    for (int i = 1, u, v, w; i <= m; i++) {
        cin >> u >> v >> w;
        adj[u].push_back ({v, w});
        adj[v].push_back ({u, w});
    }
    for (int i = 1; i <= n; i++) {
        if (vis[i]) continue;
        bfs (i);
    }
    cout << ans << '\n';
    for (int i = 1; i <= n; i++) {
        if (vis[i] == 1) cout << 'B';
        else cout << 'D';
    }
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:30:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         freopen (task".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:31:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen (task".out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 13
• Subtask 3: 0 / 18
• Subtask 4: 0 / 24
• Subtask 5: 0 / 38