Submission #507116

#	Time	Username	Problem	Language	Result	Execution time	Memory
507116		Aldas25	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	42 ms	38328 KiB

skyscraper

#include <bits/stdc++.h>

using namespace std;

#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr)
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define REP(n) FOR(O, 1, (n))
#define pb push_back
#define f first
#define s second
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vii;

const int MAXN = 30100;

int n, m;
int b[MAXN], p[MAXN];
vii adj[MAXN];
int d[2100][2100];
//bool vis[2100][2100];
//bool visSc[2100];
vi jumps[2100];

void bfs () {
    FOR(i, 0, n) FOR(j, 0, n) d[i][j] = -1;
    d[b[0]][0] = 0;
    queue<pii> q;
    q.push({b[0], 0});

    while (!q.empty()) {
        int id = q.front().f, jump = q.front().s;
        q.pop();

        jumps[id].pb(jump);

        for (int j : jumps[id]) {
            int newD = id + j;
            if (newD < n && d[newD][j] == -1) {
                d[newD][j] = d[id][jump] + 1;
                q.push({newD, j});
            }
            newD = id - j;
            if (newD >= 0 && d[newD][j] == -1) {
                d[newD][j] = d[id][jump] + 1;
                q.push({newD, j});
            }
        }
        jumps[id].clear();
    }
}

int main()
{
    FAST_IO;

    cin >> n >> m;
    FOR(i, 0, m-1) cin >> b[i] >> p[i];
    FOR(i, 0, m-1) jumps[b[i]].pb(p[i]);

    bfs();

    int ans = -1;
    FOR(i, 0, n) {
        int crD = d[b[1]][i];
        if (crD == -1) continue;
        if (ans == -1 || ans > crD)
            ans = crD;
    }

    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