Submission #683915

#	Time	Username	Problem	Language	Result	Execution time	Memory
683915		speedyArda	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	22 / 100	1097 ms	188104 KiB

skyscraper

#include "bits/stdc++.h"
 
using namespace std;
const int MAXN = 3e4+5;
 
vector< set< pair<int, int> > > adj(MAXN);
vector< set <  int > > doges(MAXN);
int dp[MAXN];
map< pair<int, int>, bool > done;
map< pair<int, int>, int> max_road;
bool visited[MAXN];
int main() 
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    int goal, begin;
    for(int i = 0; i < m; i++)
    {
        pair<int, int> temp;
        cin >> temp.first >> temp.second;
        if(i == 1)
            goal = temp.first;
        else if(i == 0)
            begin = temp.first;
        doges[temp.first].insert(temp.second);
       
    }
 
    for(int i = 0; i <= n; i++) {
        dp[i] = 1e9;
        visited[i] = false;
    }

    visited[begin] = false;
    dp[begin] = 0;
    set< pair<int, int> > curr; 
    curr.insert({0, begin});
    int ans =  1e9;
    while(!curr.empty())
    {
        pair<int, int> temp = *(curr.begin());
        int v = temp.second;
        int len = temp.first;
        //cout << v << "\n";
        curr.erase(curr.begin());
       // if(v == goal)
           // ans = min(ans, )
        for(int temp : doges[v]) {
            int currNode = v + temp;
            int cnt = 1;
            while(currNode < n)
            {
                int val = max_road[{v, currNode}];
                if(val == 0 || val > cnt)
                {
                    adj[v].erase({val, currNode});
                    max_road[{v, currNode}] = cnt;
                    adj[v].insert({cnt, currNode});
                    
                }
                //if(curr == 4)
                    //cout << temp.first << "\n";
                cnt++;
                currNode += temp;
            }

            currNode = v - temp;
            cnt = 1;
            while(currNode >= 0)
            {
                int val = max_road[{v, currNode}];
                if(val == 0 || val > cnt)
                {
                    adj[v].erase({val, currNode});
                    max_road[{v, currNode}] = cnt;
                    adj[v].insert({cnt, currNode});
                    
                }
                //if(curr == 4)
                    //cout << temp.first << "\n";
                cnt++;
                currNode -= temp;
            }
        }
        for(pair<int, int> e : adj[v])
        {
            //cout << v << " " << e.second << "\n";
            if(dp[e.second] > len + e.first)
            {
                curr.erase({dp[e.second], e.second});
                dp[e.second] = len + e.first;
                curr.insert({dp[e.second], e.second});
            }
        }
        adj[v].clear();
        //cout << v << "\n";
        //dp[v] = 1e9;
 
    }
    ans = dp[goal];
    if(ans >= 1e9)
        ans = -1;
    cout << ans << "\n";
 
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:102:9: warning: 'goal' may be used uninitialized in this function [-Wmaybe-uninitialized]
  102 |     ans = dp[goal];
      |     ~~~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43