Submission #1110744

#	Time	Username	Problem	Language	Result	Execution time	Memory
1110744		sasde	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	100 / 100	791 ms	54472 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];
vector<int>a[N];
vector<int>res[N];
bool k[N];
void bfs(int u){
    for(int i=0;i<n;++i)dist[i]=1e18;
    dist[u]=0;
    priority_queue<ii,vector<ii>,greater<ii>>p;
    p.push({dist[u],u});
    while(!p.empty()){
      u=p.top().se;
      int w=p.top().fi;
      p.pop();
      if(dist[u]<w)continue;
       for(int nhay:a[u]){
      for(int i=1;i<=n;++i){
            int v=nhay*i+u;
            if(v>n-1)break;
            if(dist[v]>dist[u]+i){
                dist[v]=dist[u]+i;
                p.push({dist[v],v});
            }
         }
      }
       for(int nhay:a[u]){
      for(int i=1;i<=n;++i){
            int v=u-nhay*i;
            if(v<0)break;
            if(dist[v]>dist[u]+i){
                dist[v]=dist[u]+i;
                p.push({dist[v],v});
            }
         }
      }
    }
}

void solve(){
  cin >> n >> m;
  for(int i=1;i<=m;++i){
    int u,v;
    cin >> u >> v;
    if(i==1)s=u;
    if(i==2)t=u;
    a[u].emb(v);

    
  }
  bfs(s);
  // for(int i=0;i<=n-1;++i)cout<<dist[i]<<" ";
  if(dist[t]==1e18)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:78:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   78 | main()
      | ^~~~
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:85:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   85 |       freopen(task".inp","r",stdin);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:86:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   86 |       freopen(task".out","w",stdout);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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