Submission #610757

#	Time	Username	Problem	Language	Result	Execution time	Memory
610757		nohaxjustsoflo	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1086 ms	18948 KiB

skyscraper

#include <bits/stdc++.h>
#include <iostream>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
typedef tree<ll,null_type,less_equal<ll>,rb_tree_tag,tree_order_statistics_node_update> order_set;
mt19937 mt_rand(chrono::high_resolution_clock::now().time_since_epoch().count());
//uniform_int_distribution<int> gen; ///(min, max)
//int random() {return gen(mt_rand);}
#pragma GCC target("popcnt")
const int mxN=30001;
const int mod=998244353;
const int mxlogN=40;
const int mxK=26;
const int inf=1e9;
const int K=600;
vector<int> who[mxN];
int n, m, a[mxN], b[mxN];
vector<int> who2[mxN];
vector<int> have;
int pos(int x, int p)
{
    x+=(p-1)*n;
    return lower_bound(have.begin(),have.end(),x)-have.begin();
}
bool vis[6000000];
vector<pair<int,int>> q, q2;
void ins(int x, int p)
{
    int id=pos(x,p);
    if(vis[id]) return;
    q.push_back({x,p});
    vis[pos(x,p)]=1;
}
void ins2(int x, int p)
{
    int id=pos(x,p);
    if(vis[id]) return;
    q2.push_back({x,p});
    vis[pos(x,p)]=1;
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n >> m;
    for(int i=0; i<m; i++) cin >> a[i] >> b[i];
    for(int i=0; i<m; i++)
    {
        who[a[i]].push_back(b[i]);
        who2[b[i]].push_back(a[i]%b[i]);
    }
    for(int i=1; i<mxN; i++)
    {
        sort(who2[i].begin(),who2[i].end());
        who2[i].erase(unique(who2[i].begin(),who2[i].end()),who2[i].end());
        for(int k=0; k*i<n; k++)
        {
            for(int j:who2[i])
            {
                if(j+k*i<n) have.push_back((i-1)*n+j+k*i);
            }
        }
    }
    int sz=have.size();
    if(sz>=6000000) return 1;
    ins(a[0],b[0]);
    int d=0;
    while(q.size())
    {
        int szz=q.size();
        for(int o=0; o<szz; o++)
        {
            int x=q[o].first;
            if(x==a[1])
            {
                cout << d << "\n";
                return 0;
            }
            for(int p:who[x]) ins(x,p);
            who[x].clear();
        }
        szz=q.size();
        for(int o=0; o<szz; o++)
        {
            auto par=q[o];
            int x=par.first, p=par.second;
            if(x-p>=0) ins2(x-p,p);
            if(x+p<n) ins2(x+p,p);
        }
        q=q2;
        q2.clear();
        d++;
    }
    cout << "-1" << "\n";
    return 0;
}

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