Submission #795395

#	Time	Username	Problem	Language	Result	Execution time	Memory
795395		nnhzzz	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	638 ms	16460 KiB

skyscraper

// cre: Nguyen Ngoc Hung - Train VOI 2024 :>

#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <unordered_set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
#include <cstring>
#include <unordered_map>
#include <cmath>
#include <array>
#include <cassert>
#include <random>

using namespace std;

#define    SORT_UNIQUE(v)  sort(ALL(v)),(v).resize(unique(ALL(v))-(v).begin())
#define        __nnhzzz__  signed main()
#define          BIT(i,j)  ((i>>j)&1LL)
#define           MASK(i)  (1LL<<i)
#define           RALL(x)  (x).rbegin(),(x).rend()
#define            ALL(x)  (x).begin(),(x).end()
#define             SZ(x)  (int)(x).size()
#define                fi  first
#define                se  second
#define               INF  0x3f3f3f3f
#define                ll  long long
#define               ull  unsigned long long
#define                ld  long double
#define                vi  vector<int>
#define               vvi  vector<vi>
#define              vvvi  vector<vvi>
#define             vvvvi  vector<vvvi>
#define               pii  pair<int,int>
#define              vpii  vector<pii>
#define      RESET(x,val)  memset((x),(val),sizeof(x))
#define REPDIS(i,be,en,j)  for(int i = (be); i<=(en); i+=j)
#define     REPD(i,be,en)  for(int i = (be); i>=(en); i--)
#define      REP(i,be,en)  for(int i = (be); i<=(en); i++)
//-------------------------------------------------------------//
const int oo = 1e9,LOG = 20,MAXN = 5e5+7,N = 1e2+3;
const int MOD = 1e9+7,MOD1 = 1e9+207,MOD2 = 1e9+407,MOD3 = 998244353;
//-------------------------------------------------------------//
template<typename T1, typename T2> bool mini(T1 &a, T2 b){if(a>b){a=b;return true;}return false;}
template<typename T1, typename T2> bool maxi(T1 &a, T2 b){if(a<b){a=b;return true;}return false;}
template<typename T> T gcd(T a, T b) { while(b) { a %= b; swap(a,b); } return a; }
template<typename T> T lcm(T a, T b) { return a/gcd(a,b)*b; }

/*
----------------------------------------------------------------
    END OF TEMPLATE
----------------------------------------------------------------
    Nguyen Ngoc Hung - nnhzzz
    Training for VOI24 gold medal
----------------------------------------------------------------
*/

int dis[MAXN];
vi adj[MAXN];

void solve(){
    int st,en,n,m; cin >> n >> m;
    REP(i,0,m-1){
        int b,p; cin >> b >> p;
        if(i==0){
            st = b;
        }
        if(i==1){
            en = b;
        }
        adj[b].push_back(p);
    }
    memset(dis,0x3f3f3f3f,sizeof dis);
    priority_queue<pii,vpii,greater<pii>> heap;
    heap.emplace(0,st); dis[st] = 0;
    while(SZ(heap)!=0){
        auto [ww,u] = heap.top(); heap.pop();
        if(dis[u]!=ww){
            continue;
        }
        if(u==en){
            cout << dis[u];
            return ;
        }
        for(auto l:adj[u]){
            for(int i = 1; u+(l*i)<n; i++){
                int v = u+(l*i);
                if(mini(dis[v],dis[u]+i)){
                    heap.emplace(dis[v],v);
                }
            }
            for(int i = 1; u-(l*i)>=0; i++){
                int v = u-(l*i);
                if(mini(dis[v],dis[u]+i)){
                    heap.emplace(dis[v],v);
                }
            }
        }
    }
    int res = dis[en];
    if(res==0x3f3f3f3f){
        res = -1;
    }
    cout << res;
}

__nnhzzz__{
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    #define name "test"
    if(fopen(name".inp","r")){
        freopen(name".inp","r",stdin);
        freopen(name".out","w",stdout);
    }
    #define name1 "nnhzzz"
    if(fopen(name1".inp","r")){
        freopen(name1".inp","r",stdin);
        freopen(name1".out","w",stdout);
    }

    int test = 1;

    while(test--){
      solve();
    }
    cerr << "\nTime elapsed: " << 1000*clock()/CLOCKS_PER_SEC << "ms\n";
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'void solve()':
skyscraper.cpp:105:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  105 |         auto [ww,u] = heap.top(); heap.pop();
      |              ^
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:140:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  140 |         freopen(name".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:141:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  141 |         freopen(name".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:145:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  145 |         freopen(name1".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:146:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  146 |         freopen(name1".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp: In function 'void solve()':
skyscraper.cpp:103:33: warning: 'st' may be used uninitialized in this function [-Wmaybe-uninitialized]
  103 |     heap.emplace(0,st); dis[st] = 0;
      |                         ~~~~~~~~^~~
skyscraper.cpp:109:9: warning: 'en' may be used uninitialized in this function [-Wmaybe-uninitialized]
  109 |         if(u==en){
      |         ^~

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