Submission #243351

#	Time	Username	Problem	Language	Result	Execution time	Memory
243351		Leonardo_Paes	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	22 / 100	47 ms	24056 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], dist1[maxn], dist2[maxn][root];
vector<int> doges[maxn];
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(dist1, inf, sizeof dist1);
    memset(dist2, inf, sizeof dist2);
    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(power <= root){
            if(dist2[u][power] != inf) continue;
            dist2[u][power] = d;
            if(u + power < n) fila.push({d + 1, {u + power, power}});
            if(u - power >= 0) fila.push({d + 1, {u - power, power}});
            for(auto x : doges[u]){
                if(u + x < n) fila.push({d + 1, {u + x, x}});
                if(u - x >= 0) fila.push({d + 1, {u - x, x}});
            }
        }
        else{
            if(dist1[u] != inf) continue;
            dist1[u] = d;
            if(u + power < n) fila.push({d + 1, {u + power, power}});
            if(u - power >= 0) fila.push({d + 1, {u - power, power}});
            for(auto x : doges[u]){
                if(u + x < n) fila.push({d + 1, {u + x, x}});
                if(u - x >= 0) fila.push({d + 1, {u - x, x}});
            }
        }
    }
    int ans = dist1[b[1]];
    for(int i=1; i<=root; i++) ans = min(ans, dist2[b[1]][i]);
    cout << (ans == inf ? -1 : ans) << "\n";
    return 0;
}

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