Submission #676284

#	Time	Username	Problem	Language	Result	Execution time	Memory
676284		Do_you_copy	Cijanobakterije (COCI21_cijanobakterije)	C++17	70 / 70	40 ms	11040 KiB

Main

//Then
#include <bits/stdc++.h>
#define pb push_back
#define fi first
#define se second
#define faster ios_base::sync_with_stdio(0); cin.tie(0);

using namespace std;
using ll = long long;
using ld = long double;
using pii = pair <int, int>;
mt19937_64 Rand(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 1e5 + 1;
//const int Mod = 1e9 + 7;
//const int inf =
int n, m;
bool visited[maxN];
vector <int> adj[maxN];
pii far;
int depth[maxN];
void dfs(int u, int p){
    depth[u] = depth[p] + 1;
    visited[u] = 1;
    far = max(far, make_pair(depth[u], u));
    for (int i: adj[u]){
        if (i == p) continue;
        dfs(i, u);
    }
}


void Init(){
    cin >> n >> m;
    for (int i = 1; i <= m; ++i){
        int u, v;
        cin >> u >> v;
        adj[u].pb(v);
        adj[v].pb(u);
    }
    int ans = 0;
    for (int i = 1; i <= n; ++i){
        if (visited[i]) continue;
        far = {0, 0};
        dfs(i, 0);
        dfs(far.se, 0);
        ans += far.fi;
    }
    cout << ans;
}

#define debug
#define taskname "test"
signed main(){
    faster
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }
    int tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
    if (fopen("timeout.txt", "r")){
        ofstream timeout("timeout.txt");
        timeout << signed(double(clock()) / CLOCKS_PER_SEC * 1000);
        timeout.close();
        #ifndef debug
        cerr << "Time elapsed: " << signed(double(clock()) / CLOCKS_PER_SEC * 1000) << "ms\n";
        #endif // debug
    }
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 6 / 6
• Subtask 3: 6 / 6
• Subtask 4: 15 / 15
• Subtask 5: 28 / 28