Submission #562449

#	Time	Username	Problem	Language	Result	Execution time	Memory
562449		piOOE	Jakarta Skyscrapers (APIO15_skyscraper)	C++11	100 / 100	980 ms	3712 KiB

skyscraper

//#define _GLIBCXX_DEBUG

//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#include <bits/stdc++.h>

using namespace std;

//#include <ext/pb_ds/assoc_container.hpp>
//
//using namespace __gnu_pbds;
//
//template<typename T>
//using ordered_set = tree<T, null_type, less < T>, rb_tree_tag, tree_order_statistics_node_update>;

//template<typename T>
//using normal_queue = priority_queue<T, vector<T>, greater<>>;

mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

#define trace(x) cout << #x << ": " << (x) << endl;
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define uniq(x) x.resize(unique(all(x)) - begin(x))
#define sz(s) ((int) size(s))
#define pii pair<int, int>
#define mp(x, y) make_pair(x, y)
#define int128 __int128
#define pb push_back
#define popb pop_back
#define eb emplace_back
#define fi first
#define se second
#define itn int

typedef long long ll;
typedef pair<ll, ll> pll;
typedef long double ld;
typedef double db;
typedef unsigned int uint;


template<typename T>
bool ckmn(T &x, T y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}

template<typename T>
bool ckmx(T &x, T y) {
    if (x < y) {
        x = y;
        return true;
    }
    return false;
}

int bit(int x, int b) {
    return (x >> b) & 1;
}

int rand(int l, int r) { return (int) ((ll) rnd() % (r - l + 1)) + l; }


const ll infL = 3e18;
const int infI = 1000000000 + 7;
const int infM = 0x3f3f3f3f; //a little bigger than 1e9
const ll infML = 0x3f3f3f3f3f3f3f3fLL; //4.5e18
const int N = 30002;
const int mod = 998244353;
const ld eps = 1e-9;

vector<int> here[N];

int b[N], p[N], dist[N];


int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, m;
    cin >> n >> m;
    for (int i = 0; i < m; ++i) {
        cin >> b[i] >> p[i];
        assert(b[i] < n);
        here[b[i]].push_back(i);
    }
    set<pair<int, int>> st;
    fill(dist, dist + N, infI);
    st.insert(mp(0, b[0]));
    dist[b[0]] = 0;
    while (!st.empty()) {
        auto [W, v] = *st.begin();
        st.erase(st.begin());
        if (v == b[1]) {
            cout << W;
            return 0;
        }
        for (int x: here[v]) {
            {
                int cost = 0;
                int to = v;
                while (to < n) {
                    if (dist[to] > dist[v] + cost) {
                        st.erase(mp(dist[to], to));
                        dist[to] = dist[v] + cost;
                        st.insert(mp(dist[to], to));
                    }
                    cost += 1;
                    to += p[x];
                }
            }
            {
                int cost = 0;
                int to = v;
                while (to > -1) {
                    if (dist[to] > dist[v] + cost) {
                        st.erase(mp(dist[to], to));
                        dist[to] = dist[v] + cost;
                        st.insert(mp(dist[to], to));
                    }
                    cost += 1;
                    to -= p[x];
                }
            }
        }
    }
    cout << -1;
    return 0;

}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:98:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   98 |         auto [W, v] = *st.begin();
      |              ^

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