제출 #496189

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
496189		model_code	Cijanobakterije (COCI21_cijanobakterije)	C++17	70 / 70	51 ms	12008 KiB

Main

#include <cstdio>
#include <vector>

using namespace std;

const int MAXN = 100005;

int n,m;
int sol=0;
vector<int> graph[MAXN];
bool visited[MAXN];

pair<int, int> find_furthest(int node, int parent=-1){
    visited[node] = true;
    pair<int,int> ret(node, 1);
    for(auto i:graph[node]){
        if(i != parent){
            auto csol = find_furthest(i, node);
            csol.second++;
            if(csol.second > ret.second){
                ret = csol;
            }
        }
    }
    return ret;
}

int radius(int node){
    auto s1 = find_furthest(node);
    return find_furthest(s1.first).second;
}

int main(){
    scanf("%d%d", &n, &m);
    for(int i=0;i<m;i++){
        int a, b;
        scanf("%d%d", &a, &b);
        a--;b--;
        graph[a].push_back(b);
        graph[b].push_back(a);
    }
    for(int i=0;i<n;i++){
        if(!visited[i]){
            sol += radius(i);
        }
    }
    printf("%d\n", sol);
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int main()':
Main.cpp:34:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp:37:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         scanf("%d%d", &a, &b);
      |         ~~~~~^~~~~~~~~~~~~~~~

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