Submission #58695343

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;

#define inf 1001000009
#define infmx 1e18
#define ff first
#define ss second
#define ll long long
#define pb push_back
#define MP make_pair
#define IOS ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL)
#define all(x) x.begin(),x.end()
///debug
#define wh(x)   cerr<<#x<<" is "<<x<<endl;
#define error(args...){string _s=#args;replace(_s.begin(),_s.end(),',',' ');stringstream _ss(_s);istream_iterator<string> _it(_ss);err(_it,args);}
void err(istream_iterator<string>it){cout<<endl;}
template<class H,class... T>void err(istream_iterator<string>it,H a,T... t){cout<<*it<<" = "<<a<<" | ";err(++it,t...);}
template<class S,class T>ostream&operator<<(ostream&os,pair<S,T>p){os<<"["<<p.first<<", "<<p.second<<"]";return os;};
template<class T>auto&operator<<(ostream& os,vector<T>_v){bool a=1;for(auto x:_v){os<<(a?"":" ")<<x;a=0;}return os;}
///
inline void YN(bool f){cout<<(f?"YES":"NO")<<endl;}
inline void Yn(bool f){cout<<(f?"Yes":"No")<<endl;}
inline void yn(bool f){cout<<(f?"yes":"no")<<endl;}


typedef pair<int,int>pi;
typedef pair<long long,long long>pll;
typedef pair<pi,int>ppi;
typedef pair<int,pi>pip;
typedef vector<int>vi;
typedef vector<pi>vpi;
const int mod=1e9+7;
ll power(ll a,ll p){ll r=1,y=a%mod;while(p){if(p&1)r=(1LL*r*y)%mod;p>>=1;y=(1LL*y*y)%mod;}return r;}

const int N=2100000;
int ara[N];


int main()
{
    IOS;
 	string s;
 	cin>>s;
 	vector<int>cnt1(26, 0), cnt2(26, 0);
 	for(auto x:s)cnt2[x-'A']++;
 	ll ans = 0;
 	for(auto x:s){
 		cnt2[x-'A']--;
 		for(int i = 0; i < 26; i++){
 			ans += 1ll * cnt1[i] * cnt2[i];
 		}
 		cnt1[x-'A']++;
 	}   
 	cout<<ans<<endl;
}

Submission Info

Compile Error

Main.cpp: In function ‘void err(std::istream_iterator<std::__cxx11::basic_string<char> >)’:
Main.cpp:16:34: warning: unused parameter ‘it’ [-Wunused-parameter]
   16 | void err(istream_iterator<string>it){cout<<endl;}
      |          ~~~~~~~~~~~~~~~~~~~~~~~~^~

Judge Result