Submission #1005310

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Source Code Expand

#include <algorithm>
#include <cassert>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <deque>
#include <iomanip>
#include <iostream>
#include <limits>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>

#define FOR(i,k,n) for (int (i)=(k); (i)<(n); ++(i))
#define rep(i,n) FOR(i,0,n)
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fst first
#define snd second
#define all(v) begin(v), end(v)
#define debug(x) cerr<< #x <<": "<<x<<endl
#define debug2(x,y) cerr<< #x <<": "<< x <<", "<< #y <<": "<< y <<endl

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vector<int> > vvi;
typedef vector<ll> vll;
typedef vector<vector<ll> > vvll;
template<class T> using vv=vector<vector< T > >;

int n;
deque<bool> reached;
vvi g;

vvi result;
void dfs(vi d_v) {
  int d = d_v[0];
  int v = d_v[1];
  vi ret = {d, v}; // distance, node
  reached[v] = true;
  result.pb(d_v);
  for (int node : g[v]) {
    if (!reached[node]) {
      dfs({d+1, node});
    }
  }
}

int main() {
  scanf("%d", &n);
  g.resize(n);
  rep (i, n-1) {
    int a, b;
    scanf("%d%d", &a, &b);
    a -= 1; b -= 1;
    g[a].pb(b);
    g[b].pb(a);
  }

  reached.assign(n, false);
  dfs({0, 0});
  sort(all(result));
  int len;
  len = result.size();
  int x = result[len-1][1];

  reached.assign(n, false);
  result.clear();
  dfs({0, x});
  sort(all(result));
  len = result.size();
  int y = result[len-1][1];
  printf("%d %d\n", x + 1, y + 1);

  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:59:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
                  ^
./Main.cpp:63:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &a, &b);
                          ^

Judge Result