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#ifndef LOCAL
#define FAST_IO
#endif
// ============
#include <bits/stdc++.h>
#define OVERRIDE(a, b, c, d, ...) d
#define REP2(i, n) for (i32 i = 0; i < (i32)(n); ++i)
#define REP3(i, m, n) for (i32 i = (i32)(m); i < (i32)(n); ++i)
#define REP(...) OVERRIDE(__VA_ARGS__, REP3, REP2)(__VA_ARGS__)
#define PER2(i, n) for (i32 i = (i32)(n)-1; i >= 0; --i)
#define PER3(i, m, n) for (i32 i = (i32)(n)-1; i >= (i32)(m); --i)
#define PER(...) OVERRIDE(__VA_ARGS__, PER3, PER2)(__VA_ARGS__)
#define ALL(x) begin(x), end(x)
#define LEN(x) (i32)(x.size())
using namespace std;
using u32 = unsigned int;
using u64 = unsigned long long;
using i32 = signed int;
using i64 = signed long long;
using f64 = double;
using f80 = long double;
using pi = pair<i32, i32>;
using pl = pair<i64, i64>;
template <typename T>
using V = vector<T>;
template <typename T>
using VV = V<V<T>>;
template <typename T>
using VVV = V<V<V<T>>>;
template <typename T>
using VVVV = V<V<V<V<T>>>>;
template <typename T>
using PQR = priority_queue<T, V<T>, greater<T>>;
template <typename T>
bool chmin(T &x, const T &y) {
if (x > y) {
x = y;
return true;
}
return false;
}
template <typename T>
bool chmax(T &x, const T &y) {
if (x < y) {
x = y;
return true;
}
return false;
}
template <typename T>
i32 lob(const V<T> &arr, const T &v) {
return (i32)(lower_bound(ALL(arr), v) - arr.begin());
}
template <typename T>
i32 upb(const V<T> &arr, const T &v) {
return (i32)(upper_bound(ALL(arr), v) - arr.begin());
}
template <typename T>
V<i32> argsort(const V<T> &arr) {
V<i32> ret(arr.size());
iota(ALL(ret), 0);
sort(ALL(ret), [&](i32 i, i32 j) -> bool {
if (arr[i] == arr[j]) {
return i < j;
} else {
return arr[i] < arr[j];
}
});
return ret;
}
#ifdef INT128
using u128 = __uint128_t;
using i128 = __int128_t;
#endif
[[maybe_unused]] constexpr i32 INF = 1000000100;
[[maybe_unused]] constexpr i64 INF64 = 3000000000000000100;
struct SetUpIO {
SetUpIO() {
#ifdef FAST_IO
ios::sync_with_stdio(false);
cin.tie(nullptr);
#endif
cout << fixed << setprecision(15);
}
} set_up_io;
void scan(char &x) { cin >> x; }
void scan(u32 &x) { cin >> x; }
void scan(u64 &x) { cin >> x; }
void scan(i32 &x) { cin >> x; }
void scan(i64 &x) { cin >> x; }
void scan(string &x) { cin >> x; }
template <typename T>
void scan(V<T> &x) {
for (T &ele : x) {
scan(ele);
}
}
void read() {}
template <typename Head, typename... Tail>
void read(Head &head, Tail &...tail) {
scan(head);
read(tail...);
}
#define CHAR(...) \
char __VA_ARGS__; \
read(__VA_ARGS__);
#define U32(...) \
u32 __VA_ARGS__; \
read(__VA_ARGS__);
#define U64(...) \
u64 __VA_ARGS__; \
read(__VA_ARGS__);
#define I32(...) \
i32 __VA_ARGS__; \
read(__VA_ARGS__);
#define I64(...) \
i64 __VA_ARGS__; \
read(__VA_ARGS__);
#define STR(...) \
string __VA_ARGS__; \
read(__VA_ARGS__);
#define VEC(type, name, size) \
V<type> name(size); \
read(name);
#define VVEC(type, name, size1, size2) \
VV<type> name(size1, V<type>(size2)); \
read(name);
// ============
#ifdef DEBUGF
#else
#define DBG(...) (void)0
#endif
i64 take_photos(i32 n, i32 m, i32 k, V<i32> r, V<i32> c) {
V<pi> pts(n);
REP(i, n) {
pts[i] = pi(r[i], c[i]);
if (pts[i].first > pts[i].second) {
swap(pts[i].first, pts[i].second);
}
}
DBG(pts);
sort(ALL(pts), [&](const pi &p, const pi &q) -> bool {
if (p.first != q.first) {
return p.first < q.first;
} else {
return p.second > q.second;
}
});
DBG(pts);
r.clear();
c.clear();
i32 ym = -1;
for (auto [x, y] : pts) {
if (chmax(ym, y)) {
r.push_back(x);
c.push_back(y);
}
}
DBG(r, c);
n = LEN(r);
chmin(k, n);
/*VV<i64> cost(n, V<i64>(n + 1));
REP(i, n) REP(j, i + 1, n + 1) {
i64 d = c[j - 1] - r[i] + 1;
cost[i][j] = d * d;
if (i > 0 && r[i] <= c[i - 1]) {
d = c[i - 1] - r[i] + 1;
cost[i][j] -= d * d;
}
}
VV<i64> dp(k + 1, V<i64>(n + 1, INF64));
dp[0][0] = 0;
REP(i, k) REP(j, n) REP(l, j + 1, n + 1) {
chmin(dp[i + 1][l], dp[i][j] + cost[j][l]);
}
i64 ans = dp[k][n];
return ans;*/
auto relaxed = [&](i64 lambda) -> i64 {
V<i64> dp(n + 1, INF64);
dp[0] = 0;
REP(i, 1, n + 1) {
REP(j, i) {
i64 cost = (c[i - 1] - r[j] + 1) * (c[i - 1] - r[j] + 1);
if (j > 0 && r[j] <= c[j - 1]) {
cost += (c[j - 1] - r[j] + 1) * (c[j - 1] - r[j] + 1);
}
cost += lambda;
chmin(dp[i], dp[j] + cost);
}
}
return dp[n] - k * lambda;
};
i64 ok = 0, ng = (i64)m * m;
while (ng - ok > 1) {
i64 mid = (ok + ng) / 2;
if (relaxed(mid) < relaxed(mid + 1)) {
ok = mid;
} else {
ng = mid;
}
}
i64 ans = relaxed(ng);
return ans;
}
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