Codeforces Round #806 (Div. 4) (F. Yet Another Problem About Pairs Satisfying an Inequality)

Bismillahir Rahmanir Rahim

///Author: Tanvir Ahmmad

///CSE,Islamic University,Bangladesh

#include<iostream>

#include<cstdio>

#include<algorithm>

#include<string>

#include<cstring>

#include<sstream>

#include<cmath>

#include<cstring>

#include<vector>

#include<queue>

#include<map>

#include<set>

#include<stack>

#include<vector>

#include<iterator>

#include <functional> ///sort(arr,arr+n,greater<int>()) for decrement of array

/*every external angle sum=360 degree

angle find using polygon hand(n) ((n-2)*180)/n*/

///Floor[Log(b) N] + 1 = the number of digits when any number is represented in base b

using namespace std;

typedef long long ll;

ll mod=1000000007;

ll dx[] = { -2, -1, 1, 2, -2, -1, 1, 2 };

ll dy[] = { -1, -2, -2, -1, 1, 2, 2, 1 };

int main()

{

ll tst,n;

cin>>tst;

while(tst--)

{

vector< pair<ll,ll> >vec;

vector<ll>v;

cin>>n;

ll arr[n+9];

for(ll i=1;i<=n;i++)

{

cin>>arr[i];

if(arr[i]<i) vec.push_back(make_pair(arr[i],i)),v.push_back(arr[i]);

}

sort(vec.begin(),vec.end());

sort(v.begin(),v.end());

ll sz=vec.size(),sum=0,up;

for(ll i=0;i<vec.size();i++)

up=((upper_bound(v.begin(), v.end(), vec[i].second)) - v.begin() + 1),sum+=(sz-up+1);

cout<<sum<<endl;

}

return 0;

}

///Alhamdulillah

Problem Link:https://codeforces.com/problemset/problem/1703/F

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