Submission #340864

#	Time	Username	Problem	Language	Result	Execution time	Memory
340864		talant117408	Mountain Trek Route (IZhO12_route)	C++17	0 / 100	1 ms	364 KiB

route

/*
    Code written by Talant I.D.
*/
  
#include <bits/stdc++.h>
  
using namespace std;
  
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
  
#define precision(n) fixed << setprecision(n)
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define mp make_pair
#define eps (double)1e-9
#define PI 2*acos(0.0)
#define endl "\n"
#define sz(v) int((v).size())
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define do_not_disturb ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define OK cout << "OK" << endl;
  
inline bool isvowel(char ch){
    ch = tolower(ch);
    return (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u');
}
  
inline bool isprime(int n){
    if(n < 2 || (n%2 == 0 && n != 2)) return false;
    for(int i = 3; i*i <= n; i++)
        if(n%i == 0) return false;
    return true;
}
 
class Union{
    private:
        vector <int> saizu, link, lborder;
    public:
        Union(int n){
            saizu.assign(n, 1); link.resize(n); lborder.resize(n);
            iota(all(link), 0); iota(all(lborder), 0);
        }
        int find(int n){
            if(link[n] == n) return n;
            return link[n] = find(link[n]);
        }
        int same(int a, int b){
            return find(a) == find(b);
        }
        void unite(int a, int b){
            if(same(a, b)) return;
             
            a = find(a); b = find(b);
            
            saizu[a] += saizu[b];
            link[b] = a;
        }
        int getsize(int a){
            return saizu[find(a)];
        }
};
 
const int mod = 1e9+7;
 
ll mode(ll a){
    a %= mod;
    if(a < 0) a += mod;
    return a;
}
 
ll subt(ll a, ll b){
    return mode(mode(a)-mode(b));
}
 
ll add(ll a, ll b){
    return mode(mode(a)+mode(b));
}
 
ll mult(ll a, ll b){
    return mode(mode(a)*mode(b));
}
 
ll binpow(ll a, ll b){
    ll res = 1;
    while(b){
        if(b&1) res = mult(res, a);
        a = mult(a, a);
        b >>= 1;
    }
    return res;
}

int main(){
    do_not_disturb
    
    int n, k;
    cin >> n >> k;
    Union mountain(n);
    vector <int> v(n);
    for(auto &to : v) cin >> to;
    for(int i = 0; i < n; i++){
        if(v[i] == v[(i+1)%n]){
            mountain.unite(i, (i+1)%n);
        }
    }
    
    set <pii> st;
    for(int i = 0; i < n; i++){
        st.insert(mp(mountain.getsize(i), mountain.find(i)));
    }
    
    priority_queue <pii> K;
    for(auto to : st){
        if(v[to.second] < min(v[(to.second-1+n)%n], v[(to.second+to.first)%n]))
        K.push(mp(-to.first, to.second));
    }
    
    int ans = 0;
    
    while(k && sz(K)){
        auto it = K.top(); K.pop();
        it.first = abs(it.first);
        if(it.first == n) break;
        
        int needed = min(v[(it.second-1+n)%n]-v[it.second], v[(it.second+it.first)%n]-v[it.second]);
        if(needed*it.first > k){
            ans += k/it.first*2;
            break;
        }
        else{
            ans += needed*2;
            k -= needed*it.first;
        }
        if(v[(it.second-1+n)%n] == min(v[(it.second-1+n)%n], v[(it.second+it.first)%n])){
            mountain.unite((it.second-1+n)%n, it.second);
            if(v[(it.second+it.first)%n] == min(v[(it.second-1+n)%n], v[(it.second+it.first)%n])){
                mountain.unite((it.second-1+n)%n, (it.second+it.first)%n);
            }
        }
        else{
            if(v[(it.second+it.first)%n] == min(v[(it.second-1+n)%n], v[(it.second+it.first)%n])){
                mountain.unite(it.second, (it.second+it.first)%n);
            }
        }
        it.second = mountain.find(it.second);
        it.first = mountain.getsize(it.second);
        if(v[it.second] < min(v[(it.second-1+n)%n], v[(it.second+it.first)%n]))
            K.push(mp(-it.first, mountain.find(it.second)));
    }
    
    cout << ans ;
    
    return 0;
}

• Subtask 1: 0 / 100