Submission #867253

#	Time	Username	Problem	Language	Result	Execution time	Memory
867253		1075508020060209tc	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	62 ms	120404 KiB

skyscraper

#pragma GCC optimize ("O3")
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;

#define int short
int n;int m;
//int dis[30100];
vector<int>e[30100];
set<int>st[30100];
//map<pair<int,int>,int>vis;
//map<pair<int,int>,int>dis;
gp_hash_table<int, int> dis[30100];
//gp_hash_table<int, bool> vis[30100];
bitset<30010>vis[30100];
int ar[30100];

//int frm[30100];
signed main(){
cin.tie(0);
ios_base::sync_with_stdio(0);
cin>>n>>m;
for(int i=0;i<m;i++){int v;
    cin>>ar[i]>>v;
    st[ar[i]].insert(v);
//    e[ar[i]].push_back(br[i]);
}
for(int i=0;i<n;i++){
    for(auto it=st[i].begin();it!=st[i].end();it++){
        e[i].push_back(*it);
    }
   // e[i].push_back(0);
}

dis[ar[0]][0]=1;
deque<pair<int,int>>dq;
dq.push_back({ar[0],0});
//int cnt=0;
while(dq.size()){
    int nw=dq.front().first;
    int nwd=dq.front().second;
   // cnt++;
    //assert(cnt<=6000000);
    dq.pop_front();
    if(vis[nw][nwd]){continue;}
    vis[nw][nwd]=1;
    if(nw==ar[1]){
        cout<<dis[nw][nwd]-1<<endl;return 0;
    }
    if(nwd==0){
    for(int i=0;i<e[nw].size();i++){
        int d=e[nw][i];
        if(vis[nw][d]){continue;}
        if(dis[nw][d]==0){
            dis[nw][d]=dis[nw][nwd];
            dq.push_front({nw,d});
            continue;
        }
        if(dis[nw][d]>dis[nw][nwd]){
            dis[nw][d]=dis[nw][nwd];
            dq.push_front({nw,d});
        }
    }e[nw].clear();
   // continue;
    }else{
        int d=0;
        if(!vis[nw][d]){
        if(dis[nw][d]==0){
            dis[nw][d]=dis[nw][nwd];
            dq.push_front({nw,d});
           // continue;
        }else{
        if(dis[nw][d]>dis[nw][nwd]){
            dis[nw][d]=dis[nw][nwd];
            dq.push_front({nw,d});
        }}
        }
    }


    if(nwd==0){continue;}
    if(((int)nw+(int)nwd)<(int)n){
        if(!vis[nw+nwd][nwd]){
        if(dis[nw+nwd][nwd]==0){
            dis[nw+nwd][nwd]=dis[nw][nwd]+1;
            dq.push_back({nw+nwd,nwd});
            //continue;
        }else{
        if(dis[nw+nwd][nwd]>dis[nw][nwd]+1){
            dis[nw+nwd][nwd]=dis[nw][nwd]+1;
            dq.push_back({nw+nwd,nwd});
        }}
        }
    }
    if((int)nw-nwd>=0){
        if(!vis[nw-nwd][nwd]){
        if(dis[nw-nwd][nwd]==0){
            dis[nw-nwd][nwd]=dis[nw][nwd]+1;
            dq.push_back({nw-nwd,nwd});
           // continue;
        }else{
        if(dis[nw-nwd][nwd]>dis[nw][nwd]+1){
            dis[nw-nwd][nwd]=dis[nw][nwd]+1;
            dq.push_back({nw-nwd,nwd});
        }}
        }
    }
}
cout<<dis[ar[1]][0]-1;


}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:52:18: warning: comparison of integer expressions of different signedness: 'short int' and 'std::vector<short int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |     for(int i=0;i<e[nw].size();i++){
      |                 ~^~~~~~~~~~~~~

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