| # | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 470133 | 2021-09-03T05:23:14 Z | robell | Jakarta Skyscrapers (APIO15_skyscraper) | C++17 | 0 ms | 0 KB |
#pragma GCC optimize("O2")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef tree<int,null_type,less<int>,rb_tree_tag, tree_order_statistics_node_update> indexed_set;
typedef long long ll;
#define int long long
#define pb push_back
#define eb emplace_back
#define countbits __builtin_popcount
#define beg0 __builtin_clz
#define terminal0 __builtin_ctz
int mod = 1e9+7;
void setIO(){
ios::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
}
void setIO(string f){
freopen((f+".in").c_str(),"r",stdin);
freopen((f+".out").c_str(),"w",stdout);
setIO();
}
int N, M;
vector<vector<pair<int,int>>> l;
vector<pair<int,int>> m;
ll main(){
setIO();
cin >> N >> M;
for (int i=0;i<M;i++) l.pb(vector<pair<int,int>>());
for (int i=0;i<M;i++){
int pos; cin >> pos;
int moves; cin >> moves;
m.pb({pos,moves});
}
for (int i=0;i<M;i++){
for (int j=0;j<M;j++){
if (i==j) continue;
if (abs(m[j].first-m[i].first)%m[i].second==0){
l[i].pb({j,abs(m[j].first-m[i].first)/m[i].second});
}
}
}
int dp[M];
for (int i=0;i<M;i++){dp[i]=1e9;}
priority_queue<pair<int,int>> pq;
pq.push({0,0});
while (!pq.empty()){
int dist = -pq.top().first;
int ind = pq.top().second;
pq.pop();
if (dp[ind]<dist) continue;
dp[ind]=dist;
for (pair<int,int> a:l[ind]){
if (dp[a.first]>a.second+dist){
pq.push({-(a.second+dist),a.first});
}
}
}
if (dp[1]==1e9){
cout << "-1\n";
}else cout << dp[1] << "\n";
}