Submission #309814

#	Time	Username	Problem	Language	Result	Execution time	Memory
309814		tjdgus4384	Stations (IOI20_stations)	C++14	0 / 100	961 ms	768 KiB

stations

#include<bits/stdc++.h>
#include "stations.h"
using namespace std;
bool visited[1001];
vector<int> path[1001];
int num1[1001], num2[1001];

int dfs1(int x, int cnt){
    num1[x] = cnt; cnt++;
    for(int i = 0;i < path[x].size();i++){
        if(visited[path[x][i]]) continue;
        visited[path[x][i]] = true;
        cnt = dfs1(path[x][i], cnt);
    }
    return cnt;
}
int dfs2(int x){
    int ret = num1[x];
    for(int i = 0;i < path[x].size();i++){
        if(visited[path[x][i]]) continue;
        visited[path[x][i]] = true;
        ret = max(ret, dfs2(path[x][i]));
    }
    return num2[x] = ret;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v){
    for(int i = 0;i < n-1;i++){
        path[u[i]].push_back(v[i]);
        path[v[i]].push_back(u[i]);
    }

    visited[0] = true;
    dfs1(0, 0);
    for(int i = 0;i < n;i++) visited[i] = false;
    visited[0] = true;
    dfs2(0);
    vector<int> ret;
    for(int i = 0;i < n;i++){
        ret.push_back(num1[i]*1000+num2[i]);
    }
    return ret;
}

int find_next_station(int s, int t, vector<int> c){
    int num2s = s%1000, num2t = t%1000;
    int num1s = (s-num2s)/1000, num1t = (t-num2t)/1000;

    for(int i = 1;i < c.size();i++){
        num2[i] = c[i]%1000; num1[i] = (c[i]-num2[i])/1000;
    }

    if(num1t > num1s && num1t <= num2s){
        int s = 1, e = c.size() - 1;
        while(s < e){
            int mid = (s+e+1)/2;
            if(num1[mid] > num1t) e = mid-1;
            else s = mid;
        }
        return c[s];
    }
    else return c[0];
}

Compilation message (stderr)

stations.cpp: In function 'int dfs1(int, int)':
stations.cpp:10:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(int i = 0;i < path[x].size();i++){
      |                   ~~^~~~~~~~~~~~~~~~
stations.cpp: In function 'int dfs2(int)':
stations.cpp:19:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for(int i = 0;i < path[x].size();i++){
      |                   ~~^~~~~~~~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:49:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |     for(int i = 1;i < c.size();i++){
      |                   ~~^~~~~~~~~~

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