Submission #867257

#	Time	Username	Problem	Language	Result	Execution time	Memory
867257		1075508020060209tc	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	25 ms	35164 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, signed> dis[30010];
//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);
}
queue<pair<pair<int,int>,signed>>q;
q.push({{ar[0],0},0});
vis[ar[0]][0]=1;
while(q.size()){
int nw=q.front().first.first;
int nwd=q.front().first.second;
signed nwv=q.front().second;
q.pop();
if(nw==ar[1]){
    cout<<nwv<<endl;return 0;
}
for(int i=0;i<e[nw].size();i++){
    int d=e[nw][i];
    int v=nw+d;
    if(v<n){
        if(!vis[v][d]){
            vis[v][d]=1;
            q.push({{v,d},nwv+1});
        }
    }
    v=nw-d;
    if(v>=0){
        if(!vis[v][d]){
            vis[v][d]=1;
            q.push({{v,d},nwv+1});
        }
    }
}
e[nw].clear();
    int v=nw-nwd;
    if(v>=0){
        if(!vis[v][nwd]){
            vis[v][nwd]=1;
            q.push({{v,nwd},nwv+1});
        }
    }
    v=nw+nwd;
    if(v<n){
        if(!vis[v][nwd]){
            vis[v][nwd]=1;
            q.push({{v,nwd},nwv+1});
        }
    }

}
cout<<-1;


}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:46:14: warning: comparison of integer expressions of different signedness: 'short int' and 'std::vector<short int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 | 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