제출 #947706

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
947706		Isam	Cijanobakterije (COCI21_cijanobakterije)	C++17	70 / 70	30 ms	18116 KiB

Main

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

int n, m, mxnode, maxd;
vector<int> g[100001];
bool vis[100001];

signed main(){
	ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	cin >> n >> m;
	for(register int i = 1, u, v; i <= m; ++i){
		cin >> u >> v;
		g[u].emplace_back(v);
		g[v].emplace_back(u);
	}
	function<void(int, int, bool, int)> Dfs = [&](int node,int len, bool f, int fa){
		if(f) vis[node] = true;
		if(maxd < len){
			maxd = len, mxnode = node;
		}
		for(int &to : g[node]){
			if(vis[to] || to == fa) continue;
			Dfs(to, len + 1, f, node);
		}
		return;
	};
	int ans(0);
	for(register int i = 1; i <= n; ++i){
		if(vis[i]) continue;
		maxd = 0;
		Dfs(i, 0, 0, i);
		Dfs(mxnode, 0, 1, mxnode);
		ans += maxd + 1;
	}
	cout << ans << '\n';
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int main()':
Main.cpp:11:19: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   11 |  for(register int i = 1, u, v; i <= m; ++i){
      |                   ^
Main.cpp:11:26: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   11 |  for(register int i = 1, u, v; i <= m; ++i){
      |                          ^
Main.cpp:11:29: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   11 |  for(register int i = 1, u, v; i <= m; ++i){
      |                             ^
Main.cpp:28:19: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   28 |  for(register int i = 1; i <= n; ++i){
      |                   ^

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