Submission #890758

#	Time	Username	Problem	Language	Result	Execution time	Memory
890758		dwuy	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	22 / 100	4 ms	10072 KiB

skyscraper

/// dwuy: _,\,,,_\,__,\,,_
#include <bits/stdc++.h>

#define fastIO ios_base::sync_with_stdio(false); cin.tie(NULL)
#define file(a) freopen(a".inp","r",stdin); freopen(a".out", "w",stdout)
#define fi first
#define se second
#define endl "\n"
#define len(s) int32_t(s.length())
#define MASK(k)(1LL<<(k))
#define TASK ""

using namespace std;

typedef tuple<int, int, int> tpiii;
typedef pair<double, double> pdd;
typedef pair<int, int> pii;
typedef long long ll;

const long long OO = 1e18;
const int MOD = 1e9 + 7;
const int INF = 1e9;
const int MX = 30005;

int n, m;
int pw[MX];
int pos[MX];
vector<int> G[MX];
bitset<MX> vist[MX];

void nhap(){
    cin >> n >> m;
    for(int i=1; i<=m; i++){
        cin >> pos[i] >>  pw[i];
        G[pos[i]].push_back(pw[i]);
    }
}

void solve(){
    queue<tuple<int, int, int>> Q;
    Q.push({pos[1], pw[1], 0});
    int ans = -1;
    while(Q.size()){
        int u, p, d;
        tie(u, p, d) = Q.front();
        Q.pop();
        if(u == pos[2]){
            ans = d;
            break;
        }
        if(u-p>0 && !vist[u-p][p]){
            vist[u-p][p] = 1;
            Q.push({u-p, p, d+1});
        }
        if(u+p<n && !vist[u+p][p]){
            vist[u+p][p] = 1;
            Q.push({u+p, p, d+1});
        }
        for(int p: G[u]){
            vist[u][p] = 1;
            if(u-p>0 && !vist[u-p][p]){
                vist[u-p][p] = 1;
                Q.push({u-p, p, d+1});
            }
            if(u+p<n && !vist[u+p][p]){
                vist[u+p][p] = 1;
                Q.push({u+p, p, d+1});
            }
        }
    }
    cout << ans;
}

int32_t main(){
    fastIO;
    //file(TASK);

    nhap();
    solve();

    return 0;
}

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