oj.uz

Submission #382788

# Submission time Handle Problem Language Result Execution time Memory
382788 2021-03-28T08:07:06 Z ne4eHbKa Planine (COCI21_planine) C++17
20 / 110
 298 ms 24924 KB 
#include <bits/stdc++.h>
using namespace std;
#ifndef _LOCAL
//#pragma GCC optimize("O3,Ofast")
#else
#pragma GCC optimize("O0")
#endif
template<typename t> inline void umin(t &a, const t b) {a = min(a, b);}
template<typename t> inline void umax(t &a, const t b) {a = max(a, b);}
typedef pair<int, int> pii;
typedef long long ll;
typedef long double ld;
typedef int8_t byte;
ll time() {return chrono::system_clock().now().time_since_epoch().count();}
mt19937 rnd(time());
#define ft first
#define sd second
#define len(f) int((f).size())
#define bnd(f) (f).begin(), (f).end()
#define _ <<' '<<
const int inf = 1e9 + 5;
const ll inf64 = 4e18 + 5;
const int md = 998244353;
namespace MD {
    void add(int &a, const int b) {if((a += b) >= md) a -= md;}
    void sub(int &a, const int b) {if((a -= b) < 0) a += md;}
    int prod(const int a, const int b) {return ll(a) * b % md;}
};

const int N = 1e6 + 5;
int h, x[N], y[N], n;
vector<pair<ld, ld>> c;

ld point(int i, int j) { return x[j] + ld(x[j] - x[i]) / (y[j] - y[i]) * (h - y[j]); }

const ld eps = 1e-15;
inline bool eq(const ld a, const ld b) {return abs(a - b) < eps;}
inline bool le(const ld a, const ld b) {return a + eps < b;}

void solve() {
    cin >> n >> h;
    for(int i = 0; i < n; ++i)
        cin >> x[i] >> y[i];
    c.clear();
    for(int i = 2; i + 1 < n; i += 2)
        c.push_back({point(i, i - 1),
                     point(i, i + 1)});
    sort(bnd(c));
    n = len(c);
    for(int i = n - 2; i >= 0; --i)
        umin(c[i].sd, c[i + 1].sd);
    int ans {};
    bool u = true;
    ld f;
    for(int i = 0; i < n; ++i) {
        if(u || le(f, c[i].ft))
            f = c[i].sd,
            ++ans,
            u = false;
    }
    cout << ans << endl;
}

signed main() {
    ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#ifndef _LOCAL
//    freopen("file.in", "r", stdin);
//    freopen("file.out", "w", stdout);
#else
    system("color a");
    freopen("in.txt", "r", stdin);
    int t; cin >> t;
    while(t--)
#endif
    solve();
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 876 KB Output is correct
2 Correct 4 ms 876 KB Output is correct
3 Correct 4 ms 876 KB Output is correct
4 Correct 34 ms 3304 KB Output is correct
5 Correct 26 ms 3304 KB Output is correct
6 Correct 28 ms 3304 KB Output is correct
7 Correct 294 ms 24796 KB Output is correct
8 Correct 298 ms 24772 KB Output is correct
9 Correct 283 ms 24924 KB Output is correct

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 492 KB Output is correct
2 Incorrect 10 ms 492 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 876 KB Output is correct
2 Correct 4 ms 876 KB Output is correct
3 Correct 4 ms 876 KB Output is correct
4 Correct 34 ms 3304 KB Output is correct
5 Correct 26 ms 3304 KB Output is correct
6 Correct 28 ms 3304 KB Output is correct
7 Correct 294 ms 24796 KB Output is correct
8 Correct 298 ms 24772 KB Output is correct
9 Correct 283 ms 24924 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Incorrect 10 ms 492 KB Output isn't correct
12 Halted 0 ms 0 KB -