Submission #1244375

#	Time	Username	Problem	Language	Result	Execution time	Memory
1244375		riddles	Dreaming (IOI13_dreaming)	C++20	Compilation error	0 ms	0 KiB

dreaming

#include "dreaming.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef map<ll, ll> mp;
typedef pair<ll, ll> pll;
typedef queue<ll> qi;
typedef vector<ll> vi;
typedef vector <vi> vvi;
typedef vector <pll> vpl;
typedef vector <string> vs;
#define YES cout<<"YES\n"
#define Yes cout<<"Yes\n"
#define NO cout<<"NO\n"
#define No cout<<"No\n"
#define F first
#define S second
#define pb push_back
#define all(x) begin(x), end(x)

void setIO(string name = "") {
    ios_base::sync_with_stdio(0); cin.tie(0);
    if ((ll)(name.size())) {
        freopen((name + ".in").c_str(), "r", stdin);
        freopen((name + ".out").c_str(), "w", stdout);
    }
}
#define MAXN 100001

ll br=0, t=1, sl=-1;
vector<pll> adj[MAXN];
ll comp[MAXN],dist[MAXN];
ll tin[MAXN], to[MAXN],fenw[MAXN+1];
vi nds[MAXN];
vi answ;

void dfs(ll nd, ll pr){
    comp[nd]=br;
    nds[br].pb(nd);
    for (pll par: adj[nd]){
        ll s=par.F, w=par.S;
        if(s==pr) continue;
        dist[s]=dist[nd]+w;
        dfs(sl, nd);
    }
}

void dfs1(ll nd, ll pr) {
    tin[nd]=t;
    t++;
    for (pll par: adj[nd]) {
        ll s=par.F, w=par.S;
        if (s == pr) continue;
        dist[s] = dist[nd] + w;
        dfs1(s, nd);
    }
    to[nd]=t-1;
}

void update(ll pos, ll val) {
    for (ll i=pos; i <=t + 1; i+=i&(-i)) fenw[i] += val;
}

ll query(ll pos) {
    ll sum=0;
    for (ll i=pos; i>0; i-=i&(-i)) sum+=fenw[i];
    return sum;
}

void resi(ll comp, ll n) {
    ll maxdist=0, maxnode=nds[comp][0];
    for (ll node: nds[comp]) {
        if (dist[node] > maxdist) {
            maxdist=dist[node];
            maxnode=node;
        }
    }
    t=1; dist[maxnode]=0; dfs1(maxnode, 0);
    ll len=0, sol=len;
    for (ll i=1; i<=t+1; i++) fenw[i]=0;
    for (ll node: nds[comp]) {
        len=max(len, dist[node]);
        sol=len;
    }
    for (ll node: nds[comp]) {
        if (dist[node] == len) update(tin[node], 1);
    }
    for (ll node: nds[comp]) {
        ll value=max(dist[node], len-dist[node]);
        if (value >= sol) continue;
        if (value == dist[node]) {
            sol=min(sol, value);
            continue;
        }
        ll broj=query(to[node]) - query(tin[node]-1);
        if (broj > 0) sol=min(sol, value);
    }
    answ.pb(sol);
}

ll travelTime(ll n, vi u, vi v, vi w) {
    for (ll i=0; i<n-1; i++) {
        adj[u[i]].pb({v[i], w[i]});
        adj[v[i]].pb({u[i], w[i]});
    }
    for (ll i=0; i<n; i++) {
        if (comp[i] == 0) {
            br++;
            dfs(i, -1);
        }
    }
    for (ll i=1; i<=br; i++) resi(i, n);
    ll ans=0;
    for (ll x: answ) ans+=x;
    return ans;
}

Compilation message (stderr)

dreaming.cpp: In function 'void setIO(std::string)':
dreaming.cpp:24:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |         freopen((name + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dreaming.cpp:25:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |         freopen((name + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccnhv2gM.o: in function `main':
grader.c:(.text.startup+0xc4): undefined reference to `travelTime'
collect2: error: ld returned 1 exit status