Submission #744309

#	Time	Username	Problem	Language	Result	Execution time	Memory
744309		bane	Dreaming (IOI13_dreaming)	C++17	Compilation error	0 ms	0 KiB

dreaming

#include<bits/stdc++.h>
#include "dreaming.h"
using namespace std;
#define int long long
const int maxN = (int)1e5 + 5;
vector<vector<pair<int,int>>>adj(maxN);
int vis[maxN], dist[maxN], parent[maxN];
int mx = 0, source = -1;
int ans = 0;
void dfs(int u, int p = -1, int d = 0){
    vis[u] = 1;
    parent[u] = p;
    dist[u] = d;
    ans = max(ans, d);
    if (mx < d){
        mx = d;
        source = u;
    }
    for (auto x : adj[u]){
        if (x.first == p){
            continue;
        }
        dfs(x.first, u, x.second + d);
    }
}

int travelTime(int N, int M, int L, int A[], int B[], int T[]){
    for (int i = 0; i < M; i++){
        //cout<<A[i]<<" "<<B[i]<<endl;
        adj[A[i]].push_back({B[i], T[i]});
        adj[B[i]].push_back({A[i], T[i]});
    }
    vector<pair<int,int>>centroids;
    for (int i = 0; i < N; i++){
        if (vis[i])continue;
        mx = -1, source = -1;
        dfs(i);
        int S = source;
        mx = -1;
        dfs(S);
        int E = source;
        vector<pair<int,int>>path;
       // cout<<S<<" "<<E<<endl;
        while(E != S){
            path.push_back({E, dist[E]});
            E = parent[E];
        }
        path.push_back({E, dist[E]});
        reverse(path.begin(), path.end());
        int diameter = path.back().second;
        int best_node = path[0].first, best_dist = 1e18;
        for(int j = 0; j < path.size(); j++){
            if(max(path[j].second, diameter - path[j].second) < best_dist){
                best_node = path[j].first;
                best_dist = max(path[j].second, diameter - path[j].second);
            }
        }
        centroids.push_back({best_dist, best_node});
    }
   // for (auto j  : centroids)cout<<j.first<<" "<<j.second<<endl;
    sort(centroids.rbegin(), centroids.rend());
    if (centroids.size() > 2)ans = max(ans, L + centroids[0].first + centroids[1].first);
    if (centroids.size() > 3)ans = max(ans, L * 2 + centroids[1].first + centroids[2].first);
    return ans;
}

/*
signed main(){
    int N = 12;
    int M = 8;
    int L = 2;
    int A[8] = {0,8,2,5,5,1,1,10};
    int B[8] = {8,2,7,11,1,3,9,6};
    int T[8] = {4,2,4,3,7,1,5,3};
    cout<<travelTime(N,M,L,A,B,T);
}
*/

Compilation message (stderr)

dreaming.cpp: In function 'long long int travelTime(long long int, long long int, long long int, long long int*, long long int*, long long int*)':
dreaming.cpp:52:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |         for(int j = 0; j < path.size(); j++){
      |                        ~~^~~~~~~~~~~~~
/usr/bin/ld: /tmp/cc7VESSr.o: in function `main':
grader.c:(.text.startup+0xd1): undefined reference to `travelTime'
collect2: error: ld returned 1 exit status