Submission #396690

#	Time	Username	Problem	Language	Result	Execution time	Memory
396690		leinad2	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1077 ms	77132 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;
int n, m, i, j, k, A[30010], a, b, w, s, e, B[30010][2];
vector<pair<int, int> >adj[30010];
map<int, int>mp[30010];
map<int, int>::iterator it;
priority_queue<pair<int, int>, vector<pair<int, int> >, greater<pair<int, int> > >pq;
main()
{
    ios_base::sync_with_stdio(!cin.tie(NULL));
    for(cin>>n>>m;i++<m;)
    {
        cin>>B[i][0]>>B[i][1];
        mp[B[i][1]][B[i][0]]++;
    }
    for(i=0;i++<30000;)
    {
        for(it=mp[i].begin();it!=mp[i].end();it++)
        {
            j=it->first;
            a=1;
            for(k=j+i;k<n;k+=i,a++)
            {
                adj[j].push_back({k, a});
                if(mp[i].find(k)!=mp[i].end())break;
            }
            a=1;
            for(k=j-i;k>=0;k-=i,a++)
            {
                adj[j].push_back({k, a});
                if(mp[i].find(k)!=mp[i].end())break;
            }
        }
    }
    s=B[1][0];e=B[2][0];
    for(i=0;i<n;i++)A[i]=1e9;
    pq.push({0, s});
    while(pq.size())
    {
        pair<int, int>p=pq.top();pq.pop();
        a=p.second;b=p.first;
        if(A[a]<1e9)continue;
        A[a]=b;
        for(i=0;i<adj[a].size();i++)
        {
            pq.push({A[a]+adj[a][i].second, adj[a][i].first});
        }
    }
    if(A[e]==1e9)A[e]=-1;cout<<A[e];
}

Compilation message (stderr)

skyscraper.cpp:8:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    8 | main()
      |      ^
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:44:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |         for(i=0;i<adj[a].size();i++)
      |                 ~^~~~~~~~~~~~~~
skyscraper.cpp:49:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   49 |     if(A[e]==1e9)A[e]=-1;cout<<A[e];
      |     ^~
skyscraper.cpp:49:26: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   49 |     if(A[e]==1e9)A[e]=-1;cout<<A[e];
      |                          ^~~~

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