Submission #994426

#	Time	Username	Problem	Language	Result	Execution time	Memory
994426		mispertion	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	262 ms	124100 KiB

skyscraper

#include<bits/stdc++.h>

using namespace std;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef long long ll;
#define int ll
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define pb push_back
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define mispertion ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0)
#define F first
#define S second
#define getlast(s) (*s.rbegin())
#define debg cout << "OK\n"

const ld PI = 3.1415926535;
const int N = 30000+5;
const int M = 7e6 + 1;
int mod = 998244353;
const int infi = INT_MAX;
const ll infl = LLONG_MAX;
const int P = 31;

int mult(int a, int b) {
    return a * 1LL * b % mod;
}

int sum(int a, int b) { 
    if (a + b < 0)
        return a + b + mod;
    if (a + b >= mod)
        return a + b - mod;
    return a + b;
}

ll binpow(ll a, ll n) {
    if (n == 0)
        return 1;
    if (n % 2 == 1) {
        return binpow(a, n - 1) * a % mod;
    } else {
        ll b = binpow(a, n / 2);
        return b * b % mod;
    }
}

int n, m, x[N], p[N], d[N];

map<pii, vector<int>> ps;
vector<pii> g[N];

void solve(){
    cin >> n >> m;
    for(int i = 0; i < m; i++){
        cin >> x[i] >> p[i];
        ps[{x[i] % p[i], p[i]}].pb(x[i]);
    }
    for(auto e : ps){
        int st = e.F.F, d = e.F.S;
        vector<int> xs = e.S;
        sort(all(xs));
        xs.resize(unique(all(xs)) - xs.begin());
        for(int i = 0; i < sz(xs) - 1; i++){
            int l = xs[i], r = xs[i + 1];
            for(int j = l; j <= r; j += d){
                g[l].pb({j, (j - l) / d});
                g[r].pb({j, (r - j) / d});
            }
        }
        for(int j = st; j <= xs[0]; j += d){
            g[xs[0]].pb({j, (xs[0] - j) / d});
        }
        for(int j = xs[sz(xs) - 1]; j < n; j += d){
            g[xs[sz(xs) - 1]].pb({j, (j - xs[sz(xs) - 1]) / d});
        }
    }
    for(int i = 0; i < n; i++)
        d[i] = infi;
    d[x[0]] = 0;
    set<pii> st;
    st.insert({0, x[0]});
    while(!st.empty()){
        int v = st.begin()->S;
        st.erase(st.begin());
        for(auto e : g[v]){
            int u = e.F, w = e.S;
            if(d[u] > d[v] + w){
                st.erase({d[u], u});
                d[u] = d[v] + w;
                st.insert({d[u], u});
            }
        }
    }
    cout << (d[x[1]] == infi ? -1 : d[x[1]]) << '\n';
}   

signed main() {
    mispertion;
    int t = 1;
    //cin >> t;
    while(t--){
        solve();
    }
    return 0;
}

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