Submission #573409

#	Time	Username	Problem	Language	Result	Execution time	Memory
573409		MohammadAghil	Money (IZhO17_money)	C++14	100 / 100	171 ms	16064 KiB

money

      #include <bits/stdc++.h>
  #pragma GCC optimize ("Ofast,unroll-loops")
// #pragma GCC target ("avx2")
    using namespace std;
  typedef long long ll;
   typedef pair<int, int> pp;
    #define er(args ...) cerr << __LINE__ << ": ", err(new istringstream(string(#args)), args), cerr << endl
      #define per(i,r,l) for(int i = (r); i >= (l); i--)
        #define rep(i,l,r) for(int i = (l); i < (r); i++)
           #define all(x) x.begin(), x.end()
              #define sz(x) (int)(x).size()
                  #define pb push_back
                      #define ss second
                           #define ff first
                                   void err(istringstream *iss){}template<typename T,typename ...Args> void err(istringstream *iss,const T &_val, const Args&...args){string _name;*iss>>_name;if(_name.back()==',')_name.pop_back();cerr<<_name<<" = "<<_val<<", ",err(iss,args...);}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const ll mod = 1e9 + 7, maxn = 1e6 + 5, lg = 22, lng = 26, inf = ll(1e9) + 5;
ll pw(ll a,ll b,ll md=mod){if(!b)return 1;ll k=pw(a,b>>1ll);return k*k%md*(b&1ll?a:1)%md;}

int prv[maxn], nxt[maxn], cnt[maxn];

void del(int x){
     prv[nxt[x]] = prv[x], nxt[prv[x]] = nxt[x];
}

int main(){
     cin.tie(0) -> sync_with_stdio(0);
     int n; cin >> n;
     vector<int> a(n);
     rep(i,0,n) cin >> a[i], cnt[a[i]]++;
     iota(nxt, nxt + maxn, 1), iota(prv, prv + maxn, -1);
     rep(i,1,maxn-1) if(!cnt[i]) del(i);
     int ans = 0, bl = 0;
     per(i,n-1,0){
          if(i == n-1 || (bl > 1 && a[i] != a[i+1] && cnt[a[i+1]]) || (a[i] != a[i+1] && prv[a[i+1]] != a[i])) bl = 0, ans++;
          if(i == n-1 || a[i] != a[i+1]) bl++;
          cnt[a[i]]--;
          if(!cnt[a[i]]) del(a[i]);
     }
     cout << ans << '\n';
     return 0; 
}

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 55 / 55