Submission #549565

#	Time	Username	Problem	Language	Result	Execution time	Memory
549565		CyberSleeper	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	36 / 100	1098 ms	33416 KiB

skyscraper

#include <bits/stdc++.h>
#define fastio      ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define debug(x)    cout << "Line " << __LINE__ << ", " << #x << " is " << x << endl
#define all(x)      x.begin(), x.end()
#define fi          first
#define se          second
#define mp          make_pair
#define pb          push_back
#define ll          long long
#define ull         unsigned long long
#define pll         pair<ll, ll>
#define pii         pair<ll, ll>
#define ld          long double
#define nl          endl
#define tb          '\t'
#define sp          ' '
#define sqr(x)      (x)*(x)
#define arr3        array<ll, 3>
using namespace std;

const ll MX=30002, MOD=1000000007, BLOCK=327, INF=2e9+7, LG=62;
const ll INFF=1000000000000000007;
const ld ERR=1e-6, pi=3.14159265358979323846;

ll N, M, B[MX], P[MX];
map<ll, ll> vis[MX];
vector<ll> doge[MX];

int main(){
    fastio;
    cin >> N >> M;
    for(ll i=0; i<M; i++){
        cin >> B[i] >> P[i];
        doge[B[i]].pb(P[i]);
    }
    queue<pii> BFS;
    BFS.push({B[0], P[0]});
    vis[B[0]][P[0]]=0;
    while(BFS.size()){
        ll idx=BFS.front().fi, p=BFS.front().se, cost=vis[idx][p], j;
        BFS.pop();
        j=idx-p;
        if(j>=0){
            if(!vis[j].count(p) || vis[j][p]>cost+1){
                vis[j][p]=cost+1;
                BFS.push({j, p});
            }
        }
        j=idx+p;
        if(j<N){
            if(!vis[j].count(p) || vis[j][p]>cost+1){
                vis[j][p]=cost+1;
                BFS.push({j, p});
            }
        }
        for(ll i:doge[idx]){
            if(vis[idx].count(i) && vis[idx][i]<cost)
                continue;
            j=idx-i;
            if(j>=0){
                if(!vis[j].count(i) || vis[j][i]>cost+1){
                    vis[j][i]=cost+1;
                    BFS.push({j, i});
                }
            }
            j=idx+i;
            if(j<N){
                if(!vis[j].count(i) || vis[j][i]>cost+1){
                    vis[j][i]=cost+1;
                    BFS.push({j, i});
                }
            }
        }
    }
    ll ans=INFF;
    for(ll i=0; i<=30000; i++){
        if(vis[B[1]].count(i))
            ans=min(ans, vis[B[1]][i]);
    }
    if(ans==INFF)
        ans=-1;
    cout << ans << nl;
}

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