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답안 #887215

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
887215 2023-12-14T05:23:53 Z vjudge1 Building Bridges (CEOI17_building) C++17
100 / 100
 58 ms 11568 KB 
// Goten2308
#include<bits/stdc++.h>

using namespace std;
#define int long long
using ll = long long;
using ii = pair <int, int>;
#define fi first
#define se second
#define mp(x, y) make_pair(x, y)
#define pb(x) push_back(x)
#define all(x) (x).begin(), (x).end()
#define endl '\n'
#define BIT(x, y) ((x >> y) & 1)
#define MASK(x) (1 << x)
#define MOD 1000000007
#define MULTI_TEST1
template <class T> bool maximize(T& a, T b) { if(a < b) { a = b; return true; } return false; }
template <class T> bool minimize(T& a, T b) { if(a > b) { a = b; return true; } return false; }
template <class T> void add(T& a, T b) { a += b; if(a >= MOD) a -= MOD; }
template <class T> void sub(T& a, T b) { a -= b; if(a <= 0) a += MOD; }

const int maxN = (int)1e5 + 7, maxVal = (int)1e6 + 7, maxLog = 63 - __builtin_clzll(maxN) + 2, INF = (int)1e17 + 7;
int val[maxVal];
vector<int> comp;

struct Line {
    ll a, b;
    Line() {
        a = 0;
        b = INF;
    }
    Line(ll _a, ll _b) {
        a = _a;
        b = _b;
    }
    ll operator() (ll x) {
        return a * x + b;
    }
} node[MASK(maxLog)];

void ins(int id, int l, int r, Line L) {
    if(l > r) return;
    if(l == r) {
        node[id] = L;
        return;
    }
    int m = (l + r) >> 1;
    if(node[id].a > L.a) swap(node[id], L);
    if(node[id](val[m]) > L(val[m])) {
        swap(node[id], L);
        ins(id << 1 | 1, m + 1, r, L);
    }else ins(id << 1, l, m, L);
}

void ins(Line L) {
    ins(1, 1, comp.size(), L);
}

ll get(int id, int l, int r, int x) {
    if(l > r) return INF;
    if(l == r) return node[id](val[x]);
    int m = (l + r) >> 1;
    if(x <= m) return min(node[id](val[x]), get(id << 1, l, m, x));
    return min(node[id](val[x]), get(id << 1 | 1, m + 1, r, x));
}

ll get(int x) {
    return get(1, 1, comp.size(), x);
}
int n, h[maxN], w[maxN], f[maxN], psW[maxN];
#define sqr(x) (x * x)
void solve() {
    cin >> n;
    vector<int> V(n + 1);
    for (int i = 1; i <= n; i++) {
        cin >> h[i];
        comp.pb(h[i]);
    }
    for (int i = 1; i <= n; i++) cin >> w[i];
    sort(all(comp));
    comp.resize(unique(all(comp)) - comp.begin());
    for(int i = 1; i <= n; i++) {
        h[i] = lower_bound(all(comp), h[i]) - comp.begin() + 1;
        val[h[i]] = comp[h[i] - 1];
        V[i] = comp[h[i] - 1];
    }
    f[1] = 0;
    for (int i = 1; i <= n; i++) {
        psW[i] = psW[i - 1] + w[i];
    }
    ins(Line(-2 * V[1], sqr(V[1]) - psW[1])); // ax + b
    for(int i = 2; i <= n; i++) {
        f[i] = get(h[i]) + sqr(V[i]) + psW[i - 1];
        ins(Line(-2 * V[i], f[i] - psW[i] + sqr(V[i])));
    }
    cout << f[n] << endl;
}

signed main(){
    #define task ""
    if(fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    if(fopen("task.inp", "r")){
        freopen("task.inp", "r", stdin);
        //freopen("task.out", "w", stdout);
    }
    cin.tie(0)->ios_base::sync_with_stdio(0);
    int nTest = 1;
    #ifdef MULTI_TEST
    cin >> nTest;
    #endif
    while(nTest--) {
        solve();
    }
    return 0;
}

Compilation message

building.cpp: In function 'int main()':
building.cpp:103:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  103 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
building.cpp:104:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  104 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
building.cpp:107:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  107 |         freopen("task.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 1 ms 8540 KB Output is correct
4 Correct 2 ms 8540 KB Output is correct
5 Correct 2 ms 8540 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 45 ms 10456 KB Output is correct
2 Correct 45 ms 11224 KB Output is correct
3 Correct 45 ms 11212 KB Output is correct
4 Correct 37 ms 10456 KB Output is correct
5 Correct 33 ms 10456 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 1 ms 8540 KB Output is correct
4 Correct 2 ms 8540 KB Output is correct
5 Correct 2 ms 8540 KB Output is correct
6 Correct 45 ms 10456 KB Output is correct
7 Correct 45 ms 11224 KB Output is correct
8 Correct 45 ms 11212 KB Output is correct
9 Correct 37 ms 10456 KB Output is correct
10 Correct 33 ms 10456 KB Output is correct
11 Correct 55 ms 11568 KB Output is correct
12 Correct 58 ms 11380 KB Output is correct
13 Correct 38 ms 11476 KB Output is correct
14 Correct 54 ms 11480 KB Output is correct
15 Correct 33 ms 11268 KB Output is correct
16 Correct 31 ms 11480 KB Output is correct
17 Correct 16 ms 11472 KB Output is correct
18 Correct 15 ms 11472 KB Output is correct