#include <bits/stdc++.h>
#define mp make_pair
#define all(a) a.begin(), a.end()
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
struct line {
ll m, b;
double x;
bool is_searching;
bool operator<(const line& b) const {
if (is_searching || b.is_searching)
return x < b.x;
return m > b.m;
}
};
typedef set<line>::iterator lineit;
set<line> hull;
bool has_prev(lineit a) {
return a != hull.begin();
}
bool has_next(lineit b) {
return next(b) != hull.end();
}
double intersection(lineit a, lineit b) {
return (a->b - b->b) / (b->m - a->m);
}
void upd_x(lineit a) {
if (has_prev(a)) {
double point = intersection(a, prev(a));
line copy = *a;
copy.x = point;
hull.erase(a);
hull.insert(copy);
}
}
bool bad(lineit a) {
if (has_next(a) && next(a)->b <= a->b)
return true;
return (has_prev(a) && has_next(a) && intersection(prev(a), next(a)) <= intersection(prev(a), a));
}
void add_line(ll m, ll b) {
auto it = hull.lower_bound({m, b, 0, 0});
if (it != hull.end() && it->m == m) {
if (it->b <= b)
return;
hull.erase(it);
}
it = hull.insert({m, b, 0, 0}).first;
if (bad(it))
hull.erase(it);
else {
while (has_prev(it) && bad(prev(it))) hull.erase(prev(it));
while (has_next(it) && bad(next(it))) hull.erase(next(it));
if (has_next(it)) upd_x(next(it));
upd_x(it);
}
}
ll query(ll val) {
lineit l = prev(hull.upper_bound({0, 0, (double)val, 1}));
return l->m * val + l->b;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
int n;
cin >> n;
vector<ll> h(n);
vector<ll> c(n);
for (int i = 0; i<n; i++)
cin >> h[i];
for (int i = 0; i < n; i++)
cin >> c[i];
vector<ll> dp(n);
vector<ll> brute_dp(n, 1e18); brute_dp[0] = 0;
for (int i = 1; i < n; i++) {
/*for (int j = 0; j < i; j++)
brute_dp[i] = min(brute_dp[i], brute_dp[j] + (h[i] - h[j]) * (h[i] - h[j]) - c[i]);*//
add_line(-2*h[i - 1], h[i - 1]*h[i - 1] + dp[i - 1]);
dp[i] = -c[i] + h[i] * h[i] + query(h[i]);
}
cout << accumulate(all(c), 0LL) + dp[n - 1] << "\n";
}
Compilation message
building.cpp: In function 'int main()':
building.cpp:95:98: error: expected primary-expression before '/' token
95 | brute_dp[i] = min(brute_dp[i], brute_dp[j] + (h[i] - h[j]) * (h[i] - h[j]) - c[i]);*//
| ^
