oj.uz

Submission #366731

# Submission time Handle Problem Language Result Execution time Memory
366731 2021-02-15T07:55:54 Z faustaadp Planine (COCI21_planine) C++17
50 / 110
 2000 ms 64092 KB 
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define pb push_back
#define mp make_pair
#define fi first
#define se second
const int NN = 1e6 + 5;
const int mo = 1e9 + 7;
const ld eps = 1e-9;
ll n, h;
ll x[NN], y[NN];
pair<ll, ll> kir[NN];
pair<ll, ll> kan[NN];
vector<ll> cln;
pair<ll, ll> cek(ll I, ll J)
{
    ll atas = x[I] * (y[J] - y[I]) + (x[J] - x[I]) * (h - y[I]);
    ll bawah = (y[J] - y[I]);
    pair<ll, ll> tmp = mp(atas, bawah);
    return tmp;
}
ll cmp(pair<ll, ll> aa, pair<ll, ll> bb)
{
    return aa.fi * bb.se < aa.se * bb.fi;
}
bool comp(pair<pair<ll, ll>, pair<ll, ll> > aa, pair<pair<ll, ll>, pair<ll, ll> > bb)
{
    return cmp(aa.fi, bb.fi);
}
void masuk(ll idx)
{
    while(cln.size() > 0 && y[cln.back()] <= y[idx])cln.pop_back();
    // while(cln.size() > 1)
    // {
    //     pair<ll, ll> A = mp(x[idx] - x[cln[cln.size() - 2]], y[idx] - y[cln[cln.size() - 2]]);
    //     pair<ll, ll> B = mp(x[cln[cln.size() - 1]] - x[cln[cln.size() - 2]], y[cln[cln.size() - 1]] - y[cln[cln.size() - 2]]);
    //     // cout << cmp(A, B) << "  " << cmp(B, A) << "@\n";
    //     // cout << A.fi << "/" << A.se << "  " << B.fi << "/" << B.se << "___\n"; 
    //     if(cmp(A, B))
    //         break;
    //     cln.pop_back();
    // }
    // while(cln.size() > 0 && y[cln.back()] <= y[idx])cln.pop_back();
    cln.pb(idx);
}
void cetak()
{
    for(ll i = 0; i < cln.size(); i++)
        cout << cln[i] << ", ";
    cout << "\n";
}
void cariL(ll idx)
{
    ll L = 0, R = cln.size() - 1;
    pair<ll, ll> H;
    H = cek(cln[0], idx);
    for(ll i = 0; i < cln.size(); i++)
        if(cmp(H, cek(cln[i], idx)))
            H = cek(cln[i], idx);
    kir[idx] = H;
    return ;
    // cout << " cari " << L << " " << R << "\n"; 
    while(L <= R)
    {
        ll C1 = L + (R - L) / 3;
        ll C2 = R - (R - L) / 3;
        pair<ll, ll> CC1 = cek(cln[C1], idx);
        pair<ll, ll> CC2 = cek(cln[C2], idx);
        // cout << C1 << ", " << C2 << "___\n";
        // cout << CC1.fi << "/" << CC1.se << "  " << CC2.fi << " " << << "___\n";
        if(y[cln[C2]] <= y[idx])
            R = C2 - 1;
        else
        if(cmp(CC1, CC2))
        {
            if(cmp(H, CC2))
                H = CC2;
            L = C1 + 1;
        }
        else
        {
            if(cmp(H, CC1))
                H = CC1;
            R = C2 - 1;
        }
    }
    // cout << H.fi << "/" << H.se << "\n";
    kir[idx] = H; 
}
void cariR(ll idx)
{
    ll L = 0, R = cln.size() - 1;
    // cout << " cari " << L << " " << R << "  " << idx << "\n"; 
    pair<ll, ll> H;
    H = cek(cln[0], idx);
    for(ll i = 0; i < cln.size(); i++)
        if(cmp(cek(cln[i], idx), H))
            H = cek(cln[i], idx);
    kan[idx] = H;
    return ;
    while(L <= R)
    {
        ll C1 = L + (R - L) / 3;
        ll C2 = R - (R - L) / 3;
        pair<ll, ll> CC1 = cek(cln[C1], idx);
        pair<ll, ll> CC2 = cek(cln[C2], idx);
        // cout << C1 << " " << C2 << "\n";
        // cout << CC1.fi << "/" << CC1.se << "  " << CC2.fi << "/" << CC2.se << "___\n";
        if(y[cln[C2]] <= y[idx])
            R = C2 - 1;
        else
        if(cmp(CC1, CC2))
        {
            if(cmp(CC1, H))
                H = CC1;
            R = C2 - 1;
        }
        else
        {
            if(cmp(CC2, H))
                H = CC2;
            L = C1 + 1;
        }
    }
    // cout << H.fi << "/" << H.se << " hai\n";
    kan[idx] = H; 
}
int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n >> h;
    for(ll i = 1; i <= n; i++)
        cin >> x[i] >> y[i];
    vector<pair<pair<ll, ll>, pair<ll, ll> > > isi;
    for(ll i = 1; i <= n; i++)
    {
        if((i % 2 == 1) && (i > 1) && (i < n))
        {
            cariL(i);
        }
        masuk(i);
        // cetak();
    }
    cln.clear();
    for(ll i = n; i >= 1; i--)
    {
        if((i % 2 == 1) && (i > 1) && (i < n))
        {
            cariR(i);
        }
        masuk(i);
        // cetak();
    }
    for(ll i = 1; i <= n; i++)
    {
        if((i % 2 == 1) && (i > 1) && (i < n))
        {
            // cout << kir[i].fi << "/" << kir[i].se << "  " << kan[i].fi << "/" << kan[i].se << "_\n";
            isi.pb(mp(kir[i], kan[i]));
        }
    }
    ll has = 0;
    sort(isi.begin(), isi.end(), comp);
    ll ada = 0;
    pair<ll, ll> mii = mp(-1, -1);
    for(ll i = 0; i < isi.size(); i++)
    {
        // cout << isi[i].fi.fi << " " << isi[i].fi.se << " " << isi[i].se.fi << " " << isi[i].se.se << "\n";
        if(i == 0 || cmp(mii, isi[i].fi))
        {
            mii = isi[i].se;
            has++;
        }
        if(cmp(isi[i].se, mii))
            mii = isi[i].se;
    }
    cout << has << "\n";
}

Compilation message

Main.cpp: In function 'void cetak()':
Main.cpp:50:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |     for(ll i = 0; i < cln.size(); i++)
      |                   ~~^~~~~~~~~~~~
Main.cpp: In function 'void cariL(ll)':
Main.cpp:59:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |     for(ll i = 0; i < cln.size(); i++)
      |                   ~~^~~~~~~~~~~~
Main.cpp: In function 'void cariR(ll)':
Main.cpp:98:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   98 |     for(ll i = 0; i < cln.size(); i++)
      |                   ~~^~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:168:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<std::pair<long long int, long long int>, std::pair<long long int, long long int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  168 |     for(ll i = 0; i < isi.size(); i++)
      |                   ~~^~~~~~~~~~~~
Main.cpp:166:8: warning: unused variable 'ada' [-Wunused-variable]
  166 |     ll ada = 0;
      |        ^~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1260 KB Output is correct
2 Correct 4 ms 1260 KB Output is correct
3 Correct 4 ms 1260 KB Output is correct
4 Correct 30 ms 7272 KB Output is correct
5 Correct 33 ms 7272 KB Output is correct
6 Correct 33 ms 7272 KB Output is correct
7 Correct 306 ms 64092 KB Output is correct
8 Correct 339 ms 63880 KB Output is correct
9 Correct 336 ms 63964 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 492 KB Output is correct
2 Correct 1 ms 492 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 492 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 1 ms 364 KB Output is correct

Subtask #3
0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1260 KB Output is correct
2 Correct 4 ms 1260 KB Output is correct
3 Correct 4 ms 1260 KB Output is correct
4 Correct 30 ms 7272 KB Output is correct
5 Correct 33 ms 7272 KB Output is correct
6 Correct 33 ms 7272 KB Output is correct
7 Correct 306 ms 64092 KB Output is correct
8 Correct 339 ms 63880 KB Output is correct
9 Correct 336 ms 63964 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 492 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 492 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 492 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 310 ms 63836 KB Output is correct
18 Correct 345 ms 63984 KB Output is correct
19 Correct 34 ms 7272 KB Output is correct
20 Correct 347 ms 63836 KB Output is correct
21 Correct 34 ms 7272 KB Output is correct
22 Correct 381 ms 63848 KB Output is correct
23 Correct 1 ms 364 KB Output is correct
24 Correct 364 ms 63992 KB Output is correct
25 Correct 32 ms 7272 KB Output is correct
26 Execution timed out 2095 ms 29548 KB Time limit exceeded
27 Halted 0 ms 0 KB -