| # | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 623167 | 2022-08-05T09:29:11 Z | Dremix10 | Sky Walking (IOI19_walk) | C++17 | 0 ms | 0 KB |
#include "walk.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
typedef long long ll;
typedef pair<int,int> pi;
typedef pair<ll,ll> pl;
#define F first
#define S second
#define all(x) (x).begin(),(x).end()
#ifdef dremix
#define p(x) cerr<<#x<<" = "<<x<<endl;
#define p2(x,y) cerr<<#x<<" , "<<#y<<" = "<<x<<" , "<<y<<endl;
#define pp(x) cerr<<#x<<" = "<<x.F<<"-"<<x.S<<endl;
#define pv(x) cerr<<#x<<" = {";for(auto v : x)cerr<<v<<", ";cerr<<"}"<<endl;
#define ppv(x) cerr<<#x<<" = {";for(auto v : x)cerr<<v.F<<"-"<<v.S<<", ";cerr<<"}"<<endl;
#else
#define p(x) {}
#define p2(x,y) {}
#define pp(x) {}
#define pv(x) {}
#define ppv(x) {}
#endif
const int N = 3e5+5;
const int MOD = 1e9+7;
const ll INF = 1e18+5;
struct ano{
int x,who;
ll d;
bool operator<(const ano &x)const{
return d > x.d;
}
};
long long min_distance(vector<int> x, vector<int> h, vector<int> l, vector<int> r, vector<int> y, int s, int g) {
int n = x.size();
int m = l.size();
vector<vector<int> > a(n+m+1);
int i,j;
vector<vector<pi> > in(n),out(n);
for(j=0;j<m;j++){
in[l[j]].push_back({y[j],n+j});
out[r[j]].push_back({y[j],n+j});
}
set<pi> st;
for(i=0;i<n;i++){
for(auto &x : in[i])st.insert(x);
for(auto &x : st){
if(x.F > h[i])break;
j = x.S;
a[i].push_back(j);
a[j].push_back(i);
}
for(auto &x : out[i])st.erase(x);
}
//if(n > 50)assert(0);
priority_queue<ano> q;
vector<__gnu_pbds::gp_hash_table<int,ll> > d(n+m+1,__gnu_pbds::gp_hash_table<int,ll>());
//vector<pl> dd(n+m,{INF);
q.push({s,n+m,0});
int cnter=0;
for(i=0;i<n+m;i++){
for(auto &v : a[i]){
d[i][v] = INF;
cnter++;
}
}
if(n>50)
assert(cnter <= (m*10*2));
d[s][n+m] = 0;
//dd[s] = {0,h[s]};
int cost,cover;
bool sky;
ll g,gg;
while(!q.empty()){
ano temp = q.top();
q.pop();
sky = false;
if(temp.x >= n)sky = true;
gg = d[temp.x][temp.who];
if(temp.d > gg)continue;
for(auto &v : a[temp.x]){
//if(v == temp.who)continue;
if(sky)
cost = abs(x[temp.who] - x[v]);
else
cost = abs(y[temp.who-n] - y[v-n]);
g = d[v][temp.x];
d[temp.x][v] = min(d[temp.x][v], gg + cost);
if(g > g + cost){
d[v][temp.x] = g + cost;
q.push({v,temp.x,g+cost});
}
}
}
ll ans = INF;
for(auto v : a[g]){
ans = min(ans,d[g][v]+y[v-n]);
}
if(ans == INF)ans = -1;
return ans;
}