Submission #722386

#	Time	Username	Problem	Language	Result	Execution time	Memory
722386		n0sk1ll	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	10 / 100	2 ms	2388 KiB

skyscraper

#include <bits/stdc++.h>

#define FAST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);cerr.tie(0)
#define mp make_pair
#define xx first
#define yy second
#define pb push_back
#define pf push_front
#define popb pop_back
#define popf pop_front
#define all(x) x.begin(),x.end()
#define ff(i,a,b) for (int i = a; i < b; i++)
#define fff(i,a,b) for (int i = a; i <= b; i++)
#define bff(i,a,b) for (int i = b-1; i >= a; i--)
#define bfff(i,a,b) for (int i = b; i >= a; i--)

using namespace std;
long double typedef ld;
unsigned int typedef ui;
long long int typedef li;
pair<int,int> typedef pii;
pair<li,li> typedef pli;
pair<ld,ld> typedef pld;
vector<vector<int>> typedef graph;
unsigned long long int typedef ull;
//const int mod = 998244353;
//const int mod = 1000000007;







//Note to self: Check for overflow

bool vis[30003];
set<int> psi[30003];

vector<pii> g[30003];

int main()
{
    FAST;

    int n,m; cin>>n>>m;
    set<pii> doges;

    int s,t;
    ff(i,0,m)
    {
        int b,p; cin>>b>>p;
        doges.insert({b,p});
        if (i==0) s=b;
        if (i==1) t=b;
    }

    for (auto [b,p] : doges) psi[b].insert(-p);

    vector<bool> tempvis(n,0);

    ff(i,0,n)
    {
        for (auto __jmp : psi[i])
        {
            int jmp=-__jmp;
            int tez=1;
            int tit=i;
            while (true)
            {
                int got=tit+jmp;
                if (got>=n) break;
                if (!tempvis[got]) g[i].pb({got,tez});
                tempvis[got]=true;
                tit=got,tez++;
                if (psi[tit].count(jmp)) break;
            }

            tez=1;
            tit=i;
            while (true)
            {
                int got=tit-jmp;
                if (got<0) break;
                if (!tempvis[got]) g[i].pb({got,tez});
                tempvis[got]=true;
                tit=got,tez++;
                if (psi[tit].count(jmp)) break;
            }
        }

        for (auto sta : g[i]) tempvis[i]=0;
    }

    priority_queue<pii,vector<pii>,greater<pii>> pq;
    pq.push({0,s});

    while (!pq.empty())
    {
        auto [d,p]=pq.top(); pq.pop();
        if (vis[p]) continue; vis[p]=1;
        if (p==t) return cout<<d,0;

        for (auto [it,w] : g[p]) pq.push({w+d,it});
    }

    cout<<-1;
}

//Note to self: Check for overflow

/*

5 3
0 2
1 1
4 1

*/

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:58:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   58 |     for (auto [b,p] : doges) psi[b].insert(-p);
      |               ^
skyscraper.cpp:92:19: warning: variable 'sta' set but not used [-Wunused-but-set-variable]
   92 |         for (auto sta : g[i]) tempvis[i]=0;
      |                   ^~~
skyscraper.cpp:100:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  100 |         auto [d,p]=pq.top(); pq.pop();
      |              ^
skyscraper.cpp:101:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  101 |         if (vis[p]) continue; vis[p]=1;
      |         ^~
skyscraper.cpp:101:31: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  101 |         if (vis[p]) continue; vis[p]=1;
      |                               ^~~
skyscraper.cpp:104:19: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  104 |         for (auto [it,w] : g[p]) pq.push({w+d,it});
      |                   ^
skyscraper.cpp:102:9: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized]
  102 |         if (p==t) return cout<<d,0;
      |         ^~

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