Submission #243362

#	Time	Username	Problem	Language	Result	Execution time	Memory
243362		Leonardo_Paes	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1088 ms	51904 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int> pii;
typedef pair<int,pii> pip;
#define f first
#define s second
const int maxn = 3e4+10, root = 180, inf = 0x3f3f3f3f;
int b[maxn], p[maxn], dist[maxn];
vector<int> doges[maxn];
struct HASH{
  size_t operator()(const pair<int,int>&x)const{
    return hash<long long>()(((long long)x.first)^(((long long)x.second)<<32));
  }
};
unordered_set<pii, HASH> mapa;
int main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    int n, m;
    cin >> n >> m;
    for(int i=0; i<m; i++){
        cin >> b[i] >> p[i];
        doges[b[i]].push_back(p[i]);
    }
    priority_queue<pip, vector<pip>, greater<pip>> fila;
    memset(dist, inf, sizeof dist);
    fila.push({0, {b[0], p[0]}});
    while(!fila.empty()){
        int d = fila.top().f, u = fila.top().s.f, power = fila.top().s.s;
        fila.pop();
        if(mapa.count({u, power})) continue;
        mapa.insert({u, power});
        if(u + power < n) fila.push({d + 1, {u + power, power}});
        if(u - power >= 0) fila.push({d + 1, {u - power, power}});
        if(dist[u] == inf){
            dist[u] = d;
            for(auto x : doges[u]) fila.push({d, {u, x}});
        }
    }
    int ans = dist[b[1]];
    cout << (ans == inf ? -1 : ans) << "\n";
    return 0;
}

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