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B.cpp
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B.cpp
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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
void solve()
{
int n, m;
cin >> n >> m;
vector<vector<ll>> a(n, vector<ll>(m)), b(m);
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
cin >> a[i][j];
b[j].push_back(a[i][j]);
}
}
for (int i = 0; i < m; i++) {
sort(b[i].begin(), b[i].end());
}
ll ans = 0;
for (int i = 0; i < m; i++) {
ll diff = 0;
for (ll j = 1; j < n; j++) {
ll t = b[i][j] - b[i][j - 1];
diff += (j * t);
ans += diff;
}
}
cout << ans << '\n';
}
int main()
{
#ifndef ONLINE_JUDGE
//freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
//freopen("Error.txt", "w", stderr);
#endif
ios_base::sync_with_stdio(false);
cin.tie(NULL), cout.tie(NULL);
int t = 1;
cin >> t;
while (t--) solve();
return 0;
}