1694B - Paranoid String - CodeForces Solution

constructive algorithms greedy *1200

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Python Code: 

t=int(input())
for _ in range(t):
    n=int(input())
    st=input()
    ans=n
    for i in range(n-1,-1,-1):
        if st[i]=='1':
            if i!=0 and st[i-1]=='0':
                ans+=i
        else:
            if i>0 and st[i-1]=='1':
                ans+=i
    print(ans)

C++ Code: 

#include <bits/stdc++.h>
#define optimizar_io ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);cout.setf(ios::fixed);cout.precision(0);
#pragma GCC optimize("Ofast")
using namespace std;
typedef long long ll;
int main()
{
    optimizar_io
    ll tt;
    cin>>tt;
    while(tt--)
    {
        ll n;
        cin>>n;
        string a;
        cin>>a;
        ll cont=0;
        for(int i=1; i<n; i++)
            if(a[i]!=a[i-1])
                cont+=i;
        cout<<cont+n<<"\n";
    }
    return 0;
}


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