This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define in insert
#define all(x) x.begin(),x.end()
#define pb push_back
#define eb emplace_back
#define ff first
#define ss second
#define int long long
typedef long long ll;
typedef vector<int> vi;
typedef set<int> si;
typedef multiset<int> msi;
typedef pair<int, int> pii;
typedef vector<pii> vpii;
// typedef pair<int, int> P;
template<typename T, typename U>
ostream & operator << (ostream &out, const pair<T, U> &c) {
out << c.first << ' ' << c.second;
return out;
}
template<typename T>
ostream & operator << (ostream &out, vector<T> &v) {
const int sz = v.size();
for (int i = 0; i < sz; i++) {
if (i) out << ' ';
out << v[i];
}
return out;
}
template<typename T>
istream & operator >> (istream &in, vector<T> &v) {
for (T &x : v) in >> x;
return in;
}
template<typename T, typename U>
istream & operator >> (istream &in, pair<T, U> &c) {
in >> c.first;
in >> c.second;
return in;
}
template<typename T>
void mxx(T &a, T b){if(b > a) a = b;}
template<typename T>
void mnn(T &a, T b){if(b < a) a = b;}
const int mxn = 2050, MXLOG = 22, mod = 1e9 + 7, P = 1181, D = 1523, N = 2500;
const long long inf = 2e18 + 10;
int a[mxn][mxn];
vector<vector<int>> solve(int l, int r) {
int sz = r - l + 1;
vector<vector<int>> ret(sz, vector<int>(sz, inf));
if(l + 1 == r) {
ret[0][1] = ret[1][0] = a[l][r];
} else {
int m = (l + r) / 2;
auto adp = solve(l, m);
auto bdp = solve(m + 1, r);
for(int i = 0; i < sz / 2; i++) {
for(int jj = 0; jj < sz / 2; jj++) {
int mn = inf;
for(int ii = 0; ii < sz / 2; ii++) {
mnn(mn, adp[i][ii] + a[ii + l][jj + m + 1]);
}
for(int j = 0; j < sz / 2; j++) {
mnn(ret[i][j + sz / 2], mn + bdp[jj][j]);
}
}
}
for(int i = 0; i < sz / 2; i++) {
for(int j = sz / 2; j < sz; j++) {
ret[j][i] = ret[i][j];
}
}
}
// cout << l << ' ' << r << endl;
// for(int i = 0; i < sz; i++) {
// for(int j = 0; j < sz; j++) {
// cout << ret[i][j] << ' ';
// }
// cout << endl;
// }
// cout << endl;
return ret;
}
void go() {
int n;
cin >> n;
for(int i = 1; i <= n; i++) {
for(int j = 1; j <= n; j++) {
cin >> a[i][j];
}
}
auto dp = solve(1, n);
int ans = inf;
for(int i = 0; i < n; i++) {
for(int j = 0; j < n; j++) {
mnn(ans, dp[i][j]);
}
}
cout << ans << endl;
}
signed main() {
fast;
int t = 1;
// cin >> t;
while(t--) {
go();
}
return 0;
}
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