Submission #948396

#	Time	Username	Problem	Language	Result	Execution time	Memory
948396		steveonalex	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	1029 ms	60372 KiB

skyscraper

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define MASK(i) (1ULL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
 
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ll mask){return __builtin_ctzll(mask);}
int logOf(ll mask){return 63 - __builtin_clzll(mask);}
 
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}
 
template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }
 
template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }
 
template <class T>
    void printArr(T& container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }
 
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

const int N = 3e4;
const int INF = 1e9 + 69;

int n, m;
vector<int> a[N];
bool activated[N];
 
int main(void){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    cin >> n >> m;
    vector<pair<int, int>> dog(m);
    for(int i = 0; i<m; ++i){
        cin >> dog[i].first >> dog[i].second;
    }

    pair<int, int> dog0 = dog[0], dog1 = dog[1];

    remove_dup(dog);

    for(auto i: dog) a[i.first].push_back(i.second);

    int ans = INF;
    map<pair<int, int>, int> dis;
    deque<pair<int, int>> q;
    q.push_back(dog0); dis[dog0] = 0;
    while(q.size()){
        pair<int, int> u = q.front(); q.pop_front();
        int d = dis[u];

        if (u.first == dog1.first) {
            minimize(ans, d);
            break;
        }

        for(int i = -u.second; i <= u.second; i += u.second * 2) {
            pair<int, int> v = {u.first + i, u.second};
            if (v.first < 0 || v.first >= n) continue;
            if (!dis.count(v)) {
                dis[v] = d + 1;
                q.push_back(v);
            }
        }
        if (!activated[u.first]){
            activated[u.first] = true;
            for(int j: a[u.first]){
                for(int i = -j; i <= j; i += j * 2) {
                    pair<int, int> v = {u.first + i, j};
                    if (v.first < 0 || v.first >= n) continue;
                    if (!dis.count(v)) {
                        dis[v] = d + 1;
                        q.push_back(v);
                    }
                }
            }
        }
    }

    if (ans == INF) cout << -1 << "\n";
    else cout << ans << "\n";

    return 0;
}

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