Submission #825549

#TimeUsernameProblemLanguageResultExecution timeMemory
825549Boycl07Building Bridges (CEOI17_building)C++17
100 / 100
41 ms10496 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; #define int ll #define rep(i, n) for(int i = 1; i <= n; ++i) #define forn(i, l, r) for(int i = l; i <= r; ++i) #define ford(i, r, l) for(int i = r; i >= l; --i) #define FOR(i, n) for(int i = 0; i < n; ++i) #define fi first #define se second #define pii pair<int, int> #define pll pair<ll, ll> #define pli pair<ll, int> #define pb push_back #define task "test" #define endl "\n" #define sz(a) int(a.size()) #define bit(i, mask) (mask >> i & 1) #define all(a) (a).begin(), (a).end() template<typename T> bool maximize(T &res, const T &val) { if (res < val){ res = val; return true; }; return false; } template<typename T> bool minimize(T &res, const T &val) { if (res > val){ res = val; return true; }; return false; } const int N = 1e6 + 2; const int S = N * 81 + 100; const int M = 101; const int K = 1e2 + 1; const int MOD = 1e9 + 9; const ll MOD2 = 1e9 + 9; const int INF = 1e13 + 9999; const ll LINF = 1e18 + 9999; const int offset = N; const int LIM = 1e6 + 2; const int AL = 26; const ll P = 1e15; const int LOG = 16; int n; int dp[N], w[N], h[N], sum[N]; bool Q = 0; struct line { mutable int a, b, p; bool operator < (const line &x) const { return Q ? p < x.p : a < x.a; } }; struct CHT : multiset<line> { int div(int x, int y) { return x / y - ((x ^ y) < 0 && x % y); } bool bad(iterator x, iterator y) { if(y == end()) {x -> p = INF; return 0;} if(x -> a == y -> a) x -> p = x -> b > y -> b ? INF : -INF; else x -> p = div(y -> b - x -> b, x -> a - y -> a); return x -> p >= y -> p; } void add(int a, int b) { auto z = insert({a, b, 0}), y = z++, x = y; while(bad(y, z)) z = erase(z); if(x != begin() && bad(--x, y)) bad(x, y = erase(y)); while((y = x) != begin() && (--x) -> p >= y -> p) bad(x, erase(y)); } int query(int x) { Q = 1; auto l = *lower_bound({0, 0, x}); Q = 0; return l.a * x + l.b; } }; CHT st; void solve() { cin >> n; rep(i, n) cin >> h[i]; rep(i, n) cin >> w[i], sum[i] = sum[i - 1] + w[i]; rep(i, n) { if(i == 1) dp[i] = 0; else dp[i] = -st.query(h[i]) + h[i] * h[i] + sum[i - 1]; st.add(2 * h[i], -(h[i] * h[i] + dp[i] - sum[i])); } cout << dp[n]; } signed main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); //freopen("building.inp", "r", stdin); //freopen("building.out", "w", stdout); int TC = 1; while(TC--) { solve(); cout << endl; //reset //reset //reset } return 0; }
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