Submission #705335

#	Time	Username	Problem	Language	Result	Execution time	Memory
705335		ToroTN	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	225 ms	65592 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;
#define X first
#define Y second
#define pb push_back
int n,m,x,y,st,ed,cnt,go,cost,u,d[30005];
set<int> s[30005];
vector<pair<int,int> > v[30005];
priority_queue<pair<int,int> > pq;
int main()
{
    scanf("%d%d",&n,&m);
    for(int i=1;i<=m;i++)
    {
        scanf("%d%d",&x,&y);
        if(i==1)st=x;
        if(i==2)ed=x;
        s[x].insert(y);
    }
    for(int i=0;i<n;i++)
    {
        for(auto it=s[i].begin();it!=s[i].end();it++)
        {
            cnt=0;
            for(int j=i-(*it);j>=0;j-=(*it))
            {
                ++cnt;
                v[i].pb({j,cnt});
                if(s[j].find(*it)!=s[j].end())break;
            }
            cnt=0;
            for(int j=i+(*it);j<n;j+=(*it))
            {
                ++cnt;
                v[i].pb({j,cnt});
                if(s[j].find(*it)!=s[j].end())break;
            }
        }
    }
    for(int i=0;i<n;i++)d[i]=1e9;
    d[st]=0;
    pq.push({0,st});
    while(!pq.empty())
    {
        u=pq.top().Y;
        pq.pop();
        for(int i=0;i<v[u].size();i++)
        {
            y=v[u][i].X,cost=v[u][i].Y;
            if(d[u]+cost<d[y])
            {
                d[y]=d[u]+cost;
                pq.push({-d[y],y});
            }
        }
    }
    if(d[ed]==1e9)
    {
        printf("-1\n");
    }else
    {
        printf("%d\n",d[ed]);
    }
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:47:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         for(int i=0;i<v[u].size();i++)
      |                     ~^~~~~~~~~~~~
skyscraper.cpp:12:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     scanf("%d%d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:15:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |         scanf("%d%d",&x,&y);
      |         ~~~~~^~~~~~~~~~~~~~

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