Submission #1110736

#	Time	Username	Problem	Language	Result	Execution time	Memory
1110736		sasde	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	0 / 100	5 ms	26960 KiB

skyscraper

#include<bits/stdc++.h>
#define int long long
#define str string
#define task "strdel"
#define ii pair<int,int>
#define iii pair<int,ii>
#define iv pair<ii,ii>
#define se second
#define fi first
#define ffi fi.fi
#define sfi se.fi
#define sse se.se
#define fse fi.se
#define lt(i, c, d) for(int i = c; i <= d; ++i)
#define fl(i, c, d) for(int i = d; i >= c; --i)
#define pb push_back
#define emb emplace_back
#define em emplace
using namespace std;
const int N=1e6+5,lg=20,mod=1e9+7;
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
int Rand(int u,int v){
 return u+rd()%(v-u+1);
}
int n,m,s,t,ans,dist[N];
ii a[N];
vector<int>res[N];
bool k[N];
void bfs(int u){
    for(int i=0;i<n;++i)dist[i]=1e9;
    dist[u]=0;
    priority_queue<iii,vector<iii>,greater<iii>>p;
    p.push({0,{a[1].fi,a[1].se}});
    while(!p.empty()){
       int u=p.top().sfi;
       int nhay=p.top().sse;
       int w=p.top().fi;
       p.pop();
       for(int i=1;i<=n;++i){
           int v=u+nhay*i;
           if(v>n-1)break;
           if(v==t)break;
           if(dist[v]>dist[u]+i){
            dist[v]=dist[u]+i;
            p.push({dist[v],{v,nhay}});
            if(!k[v]){
                k[v]=true;
                for(int i:res[v])p.push({dist[v],{v,a[i].se}});
            }
           }
       }
       for(int i=1;i<=n;++i){
           int v=u-nhay*i;
           if(v<0)break;
           if(v==t)break;
           
           if(dist[v]>dist[u]+i){
            dist[v]=dist[u]+i;
            p.push({dist[v],{v,nhay}});
             if(!k[v]){
                k[v]=true;
                for(int i:res[v])p.push({dist[v],{v,a[i].se}});
            }
           }
       }
    }
}

void solve(){
  cin >> n >> m;
  for(int i=1;i<=m;++i){
     cin >> a[i].fi >> a[i].se;
     if(i==1)s=a[i].fi;
     else if(i==2)t=a[i].fi;
    else res[a[i].fi].emb(i);
  }
  bfs(s);
  // for(int i=0;i<=n-1;++i)cout<<dist[i]<<" ";
  if(dist[t]==1e9)dist[t]=-1;
  cout << dist[t];
}
main()
{
    srand(time(0));
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    if(fopen(task".inp","r")){
      freopen(task".inp","r",stdin);
      freopen(task".out","w",stdout);
    }
    int t=1;
 //   cin >> t;
while(t--){
    solve();
    cout<<'\n';
}

}

Compilation message (stderr)

skyscraper.cpp: In function 'void bfs(long long int)':
skyscraper.cpp:37:12: warning: unused variable 'w' [-Wunused-variable]
   37 |        int w=p.top().fi;
      |            ^
skyscraper.cpp: At global scope:
skyscraper.cpp:82:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   82 | main()
      | ^~~~
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:89:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |       freopen(task".inp","r",stdin);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:90:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |       freopen(task".out","w",stdout);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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