Submission #1275306

#	Time	Username	Problem	Language	Result	Execution time	Memory
1275306		desmond1015	Dreaming (IOI13_dreaming)	C++20	Compilation error	0 ms	0 KiB

dreaming

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

#define ll long long

#include "dreaming.h"

int MOD = 1e9+7;
int INF = 1e9;

void solve() {
  int n, m, l;
  cin >> n >> m >> l;
  vector<array<int, 2>> g[n];
  for (int i = 0; i < m; i++) {
    int a, b, t;
    cin >> a >> b >> t;
    g[a].push_back({b, t});
    g[b].push_back({a, t});
  }
  vector<ll> mx(n), smx(n);
  vector<int> compId(n);
  vector<bool> vis(n);
  int cc = 0;
  function<void(int)> dfs1 = [&](int u) {
    vis[u] = true;
    compId[u] = cc;
    for (auto [v, t] : g[u]) {
      if (vis[v]) continue;
      dfs1(v);
      if (mx[v] + t > mx[u]) {
        smx[u] = mx[u];
        mx[u] = mx[v] + t;
      } else if (mx[v] + t > smx[u]) {
        smx[u] = mx[v] + t;
      }
    }
  };
  for (int i = 0; i < n; i++) {
    if (vis[i]) continue;
    dfs1(i);
    cc++;
  }
  function<void(int)> dfs2 = [&](int u) {
    vis[u] = true;
    for (auto [v, t] : g[u]) {
      if (vis[v]) continue;
      if (mx[v] + t == mx[u]) {
        if (smx[u] + t > mx[v]) {
          smx[v] = mx[v];
          mx[v] = smx[u] + t;
        } else if (smx[u] + t > smx[v]) {
          smx[v] = smx[u] + t;
        }
      } else {
        if (mx[u] + t > mx[v]) {
          smx[v] = mx[v];
          mx[v] = mx[u] + t;
        } else if (mx[u] + t > smx[v]) {
          smx[v] = mx[u] + t;
        }
      }
      dfs2(v);
    }
  };
  vis.assign(n, false);
  for (int i = 0; i < n; i++) {
    if (vis[i]) continue;
    dfs2(i);
  }
  vector<ll> comp(cc, 1e17);
  for (int i = 0; i < n; i++) {
    int id = compId[i];
    comp[id] = min(comp[id], mx[i]);
  }
  sort(comp.rbegin(), comp.rend());
  assert(cc > 1);
  ll ans = comp[0] + comp[1] + l;
  cout << ans << '\n';
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);

  // freopen("input.txt", "r", stdin);
  // freopen("output.txt", "w", stdout);

  // freopen("input.in", "r", stdin);
  // freopen("output.out", "w", stdout);

  // int T = 1;
  // cin >> T;
  // while (T--) {
    solve();
  // }

  return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccAnKTDj.o: in function `main':
grader.c:(.text.startup+0x0): multiple definition of `main'; /tmp/ccIKXvhZ.o:dreaming.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccAnKTDj.o: in function `main':
grader.c:(.text.startup+0xc5): undefined reference to `travelTime'
collect2: error: ld returned 1 exit status