제출 #676268

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
676268		Tangirkul	Cijanobakterije (COCI21_cijanobakterije)	C++17	70 / 70	51 ms	11780 KiB

Main

#include<bits/stdc++.h>
  
#define ll long long
#define fi first
#define se second
#define pb push_back
#define sz size
#define Junanna ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
  
using namespace std;
  
const ll K = 32;
const ll INF = 1e9 + 7;
const ll MOD = 1e9 + 7;
const ll N = (1e5 + 125);
 
ll n, m;
vector <ll> g[N];
bool used[N], used1[N];
pair <ll, ll> ans;

void dfs (ll v, ll d)
{
    if (d > ans.fi)
    {
        ans = {d, v};
    }
    used[v] = 1;
    for (ll i = 0; i < g[v].sz (); i++)
    {
        ll to = g[v][i];
        if (!used[to])
        {
            dfs (to, d + 1);
        }
    }
}

void dfss (ll v, ll d)
{
    if (d > ans.fi)
    {
        ans = {d, v};
    }
    used1[v] = 1;
    for (ll i = 0; i < g[v].sz (); i++)
    {
        ll to = g[v][i];
        if (!used1[to])
        {
            dfss (to, d + 1);
        }
    }
}

void ma1n ()
{
    cin >> n >> m;
    for (ll i = 1; i <= m; i++)
    {
        ll x, y;
        cin >> x >> y;
        g[x].pb (y);
        g[y].pb (x);
    }
    ll dis = 0;
    for (ll i = 1; i <= n; i++)
    {
        if (!used[i])
        {
            dfs (i, 1);
            ans.fi = 0;
            dfss (ans.se, 1);
            dis += ans.fi;
            ans = {0, 0};
        }
    }
    cout << dis;
}
    
int main ()
{
    Junanna;
    ll t = 1;
    while (t--)
    {
        ma1n ();
    }
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'void dfs(long long int, long long int)':
Main.cpp:29:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for (ll i = 0; i < g[v].sz (); i++)
      |                    ~~^~~~~~~~~~~~
Main.cpp: In function 'void dfss(long long int, long long int)':
Main.cpp:46:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |     for (ll i = 0; i < g[v].sz (); i++)
      |                    ~~^~~~~~~~~~~~

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