Submission #876986

#TimeUsernameProblemLanguageResultExecution timeMemory
876986Ahmed_SolymanEkoeko (COCI21_ekoeko)C++14
0 / 110
1 ms600 KiB
/* In the name of Allah made by: Ahmed_Solyman */ #include <bits/stdc++.h> #include <ext/rope> using namespace std; using namespace __gnu_cxx; #pragma GCC optimize("-Ofast") #pragma GCC optimize("-O1") //-------------------------------------------------------------// typedef long long ll; typedef unsigned long long ull; #define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0); #define PI acos(-1) #define lb lower_bound #define ub upper_bound #define endl '\n' #define all(v) v.begin(),v.end() #define allr(v) v.rbegin(),v.rend() #define sum_to(n) (n*(n+1))/2 #define pb push_back #define pf push_front #define fil(arr,x) memset(arr,x,sizeof(arr)) const ll mod=1e9+7; int dx[8]={0,1,0,-1,1,1,-1,-1}; int dy[8]={1,0,-1,0,1,-1,-1,1}; //-------------------------------------------------------------// ll lcm(ll a,ll b) { return (max(a,b)/__gcd(a,b))*min(a,b); } void person_bool(bool x) { cout<<(x?"YES":"NO")<<endl; } struct BIT{ vector<int>bit; int n; void init(int _n){ bit.assign(_n+5,0LL); n=_n; } void add(int i,int v){ while(i<=n)bit[i]+=v,i+=i&(-i); } int sum(int i){ int ret=0; while(i)ret+=bit[i],i-=i&(-i); return ret; } int query(int l,int r){ return sum(r)-sum(l-1); } }b; int main() { //freopen("input.txt","r",stdin); //freopen("output.txt","w",stdout); #ifndef ONLINE_JUDGE // freopen("input.in", "r", stdin); // freopen("output.out", "w", stdout); #endif fast int n;cin>>n; string u;cin>>u; b.init(n+5); vector<int>s(2*n+1); vector<int>g[26]; for(int i=0;i<n*2;i++){ s[i+1]=u[i]-'a'; if(i<n)g[u[i]-'a'].push_back(i+1); } int cnt[26]={}; ll ans=0; for(int i=n+1;i<=2*n;i++){ assert((cnt[s[i]]++)<(int)g[s[i]-'a'].size()); } cout<<ans<<endl; return 0; }
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