Submission #240993

#	Time	Username	Problem	Language	Result	Execution time	Memory
240993		WhaleVomit	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	1098 ms	69400 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;

#define f first
#define s second
#define pb push_back
#define mp make_pair
#define all(v) v.begin(), v.end()
#define sz(v) (int)v.size()

#define MOO(i, a, b) for(int i=a; i<b; i++)
#define M00(i, a) for(int i=0; i<a; i++)
#define MOOd(i,a,b) for(int i = (b)-1; i >= a; i--)
#define M00d(i,a) for(int i = (a)-1; i>=0; i--)

#define FAST ios::sync_with_stdio(0); cin.tie(0);
#define finish(x) return cout << x << '\n', 0;
#define dbg(x) cerr << ">>> " << #x << " = " << x << "\n";
#define _ << " _ " <<

typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int,int> pi;
typedef pair<ld,ld> pd;
typedef complex<ld> cd;

const int inf = 1e8;
const int MAX_N = 30030;
int d[MAX_N];
int n, m;
set<int> doges[MAX_N];

int main() { FAST
    cin >> n >> m;
    int st = -1, en = -1;
    M00(i, m) {
        int b, p; cin >> b >> p;
        if(i == 0) st = b;
        else if(i == 1) en = b;
        doges[b].insert(p);
    }
    priority_queue<pi, vector<pi>, greater<pi>> pq;
    M00(i, n) d[i] = inf;
    pq.push(mp(0, st));
    while(!pq.empty()) {
        pi t = pq.top(); pq.pop();
        if(d[t.s] != inf) continue;
        d[t.s] = t.f;
       
        for(int j: doges[t.s]) {
            int i = t.s;
            for(int x = i+j; x < n; x += j) {
                if(d[x] == inf) pq.push(mp(d[t.s] + (x-i)/j, x)); 
                if(doges[x].count(j)) break;
            }
            for(int x = i-j; x >= 0; x -= j) {
                if(d[x] == inf) pq.push(mp(d[t.s] + (i-x)/j, x)); 
                if(doges[x].count(j)) break;
            }
        }
    }
    int res = d[en];
    if(res == 1e8) {
        finish(-1);
    }
    cout << res << "\n";
}

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