Submission #795786

#	Time	Username	Problem	Language	Result	Execution time	Memory
795786		alexander707070	Stations (IOI20_stations)	C++14	0 / 100	668 ms	856 KiB

stations

#include<bits/stdc++.h>
#define MAXN 1007
using namespace std;

int n,root;
vector<int> sol,v[MAXN];
int tim,num[MAXN];
bool vis[MAXN];
queue<int> q;

void dfs(int x,int p,int dep){
    num[x]=tim; tim++;
    for(int i=0;i<v[x].size();i++){
        if(v[x][i]!=p)dfs(v[x][i],x,dep+1);
    }
    sol[x]=num[x];
}

void bfs(int x){
    vis[x]=true;
    for(int i=0;i<v[x].size();i++){
        if(vis[v[x][i]])continue;
        vis[v[x][i]]=true;
        num[v[x][i]]=tim; tim++;
        q.push(v[x][i]);
    }
}

vector<int> label(int N, int k,vector<int> from,vector<int> to){
    n=N;
    sol.resize(n);
    for(int i=0;i<n;i++){
        v[i].clear(); vis[i]=false;
    }
    tim=0;

    for(int i=0;i<n-1;i++){
        v[from[i]].push_back(to[i]);
        v[to[i]].push_back(from[i]);
    }

    for(int i=0;i<n;i++){
        if(v[i].size()==2){
            root=i;
        }
    }

    vis[root]=true;
    num[root]=tim; tim++;
    q.push(root);

    while(!q.empty()){
        bfs(q.front());
        q.pop();
    }

    for(int i=0;i<n;i++){
        sol[i]=num[i];
    }

    return sol;
}

int find_next_station(int s, int t,vector<int> c){
    s++; t++;
    if(t<s){
        for(int i=0;i<c.size();i++){
            if(c[i]<s)return c[i];
        }
    }else{
        while(t/2>s){
            t/=2;
        }
        for(int i=0;i<c.size();i++){
            if(t==c[i]+1)return c[i];
        }
    }
}

Compilation message (stderr)

stations.cpp: In function 'void dfs(int, int, int)':
stations.cpp:13:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~
stations.cpp: In function 'void bfs(int)':
stations.cpp:21:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:67:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |         for(int i=0;i<c.size();i++){
      |                     ~^~~~~~~~~
stations.cpp:74:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |         for(int i=0;i<c.size();i++){
      |                     ~^~~~~~~~~
stations.cpp:78:1: warning: control reaches end of non-void function [-Wreturn-type]
   78 | }
      | ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 16
• Subtask 4: 0 / 10
• Subtask 5: 0 / 61