#include "bits/extc++.h"
using namespace std;
template <typename T, typename... U>
void dbgh(const T& t, const U&... u) {
cerr << t;
((cerr << " | " << u), ...);
cerr << endl;
}
#ifdef DEBUG
#define dbg(...) \
cerr << "L" << __LINE__ << " [" << #__VA_ARGS__ << "]: "; \
dbgh(__VA_ARGS__)
#else
#define dbg(...)
#define cerr \
if (false) \
cerr
#endif
using ll = long long;
#define endl "\n"
#define long int64_t
#define sz(x) int(std::size(x))
ll min_total_length(vector<int> arr_r, vector<int> arr_b) {
int n = sz(arr_r), m = sz(arr_b);
long dp[n + 1][m + 1];
memset(dp, 0x3f, sizeof(dp));
dp[n][m] = 0;
for (int i = n - 1; i >= 0; i--) {
for (int j = m - 1; j >= 0; j--) {
dp[i][j] = abs(arr_r[i] - arr_b[j]) +
min({dp[i + 1][j], dp[i][j + 1], dp[i + 1][j + 1]});
}
}
dbg(dp[0][0], dp[1][1], dp[2][2], dp[3][3]);
return dp[0][0];
}
