uva_cpp_clean/10041/10041-2.cpp

#include "bits/stdc++.h"

using namespace std;
#define el "\n"
#define F first
#define S second
#define PI 3.14159265358979323846  /* pi */
#define INF 9876543210LL
#define FOR(i,a,b) for(int i = a; i <= b; ++i)
#define FORD(i,a,b) for(int i = a; i >= b; --i)
#define RI(i,n) FOR(i,1,n)
#define REP(i,n) FOR(i,0,(n)-1)
#define SQR(x) (x)*(x)
#define all(v)  	((v).begin()),((v).end())
#define degreesToRadians(angleDegrees) (angleDegrees * PI / 180.0) // Converts degrees to radians.
#define radiansToDegrees(angleRadians) (angleRadians * 180.0 / PI) // Converts radians to degrees.
typedef long long ll;
typedef pair<int, int>	pii;
typedef pair<ll, ll>	pll;
typedef long double ld;
typedef vector<int>		vi;
typedef vector<ll>		vll;
typedef vector<pii>		vpii;
typedef vector<pll>		vpll;
const double EPS = 1e-9;
const int N = 1e3+2, M = 3e5+5, OO = 0x3f3f3f3f;
// int dx[] = {1,-1,0,0} , dy[] = {0,0,1,-1}; // 4 Direction
// int dx[] = {1,-1,0,0,1,1,-1,-1}, dy[] = {0,0,1,-1,1,-1,1,-1}; // 8 Direction
// int dx[] = {1,-1,1,-1,2,2,-2,-2} , dy[] = {2,2,-2,-2,1,-1,1,-1}; // Knight Direction
// int dx[] = {2,-2,1,1,-1,-1} , dy[] = {0,0,1,-1,1,-1}; // Hexagonal Direction

int main() {
    // ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	// freopen("input.txt", "r", stdin);
	// freopen("output.txt", "w", stdout);
    int tc; scanf("%d", &tc);
    while (tc--) {
        int n; scanf("%d", &n);
        vector<int> v(n);
        for(int& i: v) scanf("%d",&i);
        sort(all(v));
        int b = 0, sum = 0;
        
        if(n%2!=0) b=v[n/2];
        else b=v[n/2];
             
        for(int i=n/2+1;i<n;i++) 
            sum=sum+abs(v[i]-b);
        for(int i=n/2-1;i>=0;i--)
            sum=sum+abs(b-v[i]);

        printf("%d\n", sum);
    }
    return 0;
}