Submission #84909

#	Time	Username	Problem	Language	Result	Execution time	Memory
84909		popovicirobert	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	682 ms	16264 KiB

skyscraper

#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long

using namespace std;

const int INF = 1e9;
const int MAXN = 30000;

vector <int> arr[MAXN + 1];
map < pair <int, int>, bool > mp;

struct Data {
    int dst, nod;
    bool operator <(const Data &other) const {
        return dst > other.dst;
    }
};

priority_queue < Data > pq;
bool vis[MAXN + 1];
int dist[MAXN + 1];

int main() {
    //ifstream cin("C.in");
    //ofstream cout("C.out");
    int i, n, m;
    ios::sync_with_stdio(false);
    cin >> n >> m;
    int nod1, nod2;
    for(i = 0; i < m; i++) {
        int nod, jump;
        cin >> nod >> jump;
        if(mp[{nod, jump}] == 1) {
            continue;
        }
        mp[{nod, jump}] = 1;
        arr[nod].push_back(jump);
        if(i == 0) {
            pq.push({0, nod});
            nod1 = nod;
        }
        if(i == 1) {
            nod2 = nod;
        }
    }
    for(i = 0; i < n; i++) {
        dist[i] = INF;
    }
    dist[nod1] = 0;
    while(!pq.empty()) {
        int nod = pq.top().nod;
        int dst = pq.top().dst;
        pq.pop();
        if(vis[nod]) {
            continue;
        }
        if(nod == nod2) {
            cout << dst;
            return 0;
        }
        vis[nod] = 1;
        for(auto it : arr[nod]) {
            int aux = nod - it;
            int cst = 1;
            while(aux >= 0) {
                if(dist[aux] > dst + cst) {
                    dist[aux] = dst + cst;
                    pq.push({dist[aux], aux});
                }
                aux -= it;
                cst++;
            }
            aux = nod + it;
            cst = 1;
            while(aux < n) {
                if(dist[aux] > dst + cst) {
                    dist[aux] = dst + cst;
                    pq.push({dist[aux], aux});
                }
                aux += it;
                cst++;
            }
        }
    }
    cout << -1;
    //cin.close();
    //cout.close();
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:58:9: warning: 'nod2' may be used uninitialized in this function [-Wmaybe-uninitialized]
         if(nod == nod2) {
         ^~
skyscraper.cpp:50:16: warning: 'nod1' may be used uninitialized in this function [-Wmaybe-uninitialized]
     dist[nod1] = 0;
     ~~~~~~~~~~~^~~

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