Submission #679725

#	Time	Username	Problem	Language	Result	Execution time	Memory
679725		abcvuitunggio	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	100 / 100	123 ms	10692 KiB

skyscraper

#include <iostream>
#include <queue>
#include <vector>
#include <algorithm>
#define int long long
using namespace std;
const int INF=1e18;
priority_queue <pair <int, int>, vector <pair <int, int>>, greater <pair <int, int>>> q;
int n,m,b,p,s,t,d[50001];
vector <int> ke[50001];
int32_t main(){
    ios_base::sync_with_stdio(NULL);cin.tie(nullptr);
    cin >> n >> m;
    for (int i=0;i<m;i++){
        cin >> b >> p;
        ke[b].push_back(p);
        if (!i)
            s=b;
        if (i==1)
            t=b;
    }
    for (int i=0;i<n;i++){
        d[i]=INF;
        sort(ke[i].begin(),ke[i].end());
        ke[i].resize(unique(ke[i].begin(),ke[i].end())-ke[i].begin());
    }
    q.push({0,s});
    d[s]=0;
    while (!q.empty()){
        int u=q.top().second,du=q.top().first;
        q.pop();
        if (d[u]!=du)
            continue;
        for (int p:ke[u]){
            for (int v=u+p;v<n;v+=p){
                if (d[v]>d[u]+(v-u)/p){
                    d[v]=d[u]+(v-u)/p;
                    q.push({d[v],v});
                }
                int pos=lower_bound(ke[v].begin(),ke[v].end(),p)-ke[v].begin();
                if (pos<ke[v].size()&&ke[v][pos]==p)
                    break;
            }
            for (int v=u-p;v>=0;v-=p){
                if (d[v]>d[u]+(u-v)/p){
                    d[v]=d[u]+(u-v)/p;
                    q.push({d[v],v});
                }
                int pos=lower_bound(ke[v].begin(),ke[v].end(),p)-ke[v].begin();
                if (pos<ke[v].size()&&ke[v][pos]==p)
                    break;
            }
        }
    }
    cout << (d[t]==INF?-1:d[t]);
}

Compilation message (stderr)

skyscraper.cpp: In function 'int32_t main()':
skyscraper.cpp:41:24: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |                 if (pos<ke[v].size()&&ke[v][pos]==p)
      |                     ~~~^~~~~~~~~~~~~
skyscraper.cpp:50:24: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |                 if (pos<ke[v].size()&&ke[v][pos]==p)
      |                     ~~~^~~~~~~~~~~~~

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