Submission #42124

#	Time	Username	Problem	Language	Result	Execution time	Memory
42124		XmtosX	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	10 / 100	8 ms	1316 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
int n,p[30004],b[30004],m;
priority_queue <pair<int,int> ,vector <pair<int,int> >,greater <pair<int,int> > > pq;
bool vis[30004];
vector <int> v[30004];
int cur[30004];
void dij()
{
    for (int i=1;i<n;i++)
        cur[i]=INT_MAX;
    for (int i=0;i<v[b[0]].size();i++)
        cur[v[b[0]][i]]=0,pq.push({0,v[b[0]][i]});
    while (!pq.empty())
    {
        int x= (pq.top()).second;
        int y= (pq.top()).first;
        pq.pop();
        if (vis[x])
            continue;
        vis[x]=true;
        for (int i=0;i*p[x]+b[x]<n;i++)
        {
            int a= (i*p[x]+b[x]);
            for (int j=0;j<v[a].size();j++)
            {
                if (cur[v[a][j]]>i+y)
                {
                    pq.push({i+y,v[a][j]});
                    cur[v[a][j]]=i+y;
                }
            }
        }
        for (int i=1;b[x]-i*p[x]>=0;i++)
        {
            int a= (b[x]-i*p[x]);
            for (int j=0;j<v[a].size();j++)
            {
                if (cur[v[a][j]]>i+y)
                {
                    pq.push({i+y,v[a][j]});
                    cur[v[a][j]]=i+y;
                }
            }
        }
    }
}
int main()
{
    cin >>n>>m;
    for (int i=0;i<m;i++)
    {
        cin >>b[i]>>p[i];
        v[b[i]].push_back(i);
    }
    dij();
    if (cur[1]==INT_MAX)
        cout <<-1;
    else
        cout <<cur[1];
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'void dij()':
skyscraper.cpp:12:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=0;i<v[b[0]].size();i++)
                   ^
skyscraper.cpp:25:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int j=0;j<v[a].size();j++)
                           ^
skyscraper.cpp:37:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int j=0;j<v[a].size();j++)
                           ^

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