oj.uz

Submission #46838

# Submission time Handle Problem Language Result Execution time Memory
46838 2018-04-23T18:48:57 Z qoo2p5 Bulldozer (JOI17_bulldozer) C++17
75 / 100
 829 ms 63236 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

const int INF = (int) 1e9 + 1e6;
const ll LINF = (ll) 1e18 + 1e9;
const ll MOD = (ll) 1e9 + 7;

#define sz(x) (int) (x).size()
#define mp(x, y) make_pair(x, y)
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define lb(s, t, x) (int) (lower_bound(s, t, x) - s)
#define ub(s, t, x) (int) (upper_bound(s, t, x) - s)
#define rep(i, f, t) for (auto i = f; i < t; ++(i))
#define per(i, f, t) for (auto i = (f); i >= (t); --(i))

ll power(ll x, ll y, ll mod = MOD) {
    if (y == 0) {
        return 1;
    }
    if (y & 1) {
        return power(x, y - 1, mod) * x % mod;
    } else {
        ll tmp = power(x, y / 2, mod);
        return tmp * tmp % mod;
    }
}

template<typename A, typename B> bool mini(A &x, const B &y) {
    if (y < x) {
        x = y;
        return true;
    }
    return false;
}

template<typename A, typename B> bool maxi(A &x, const B &y) {
    if (x < y) {
        x = y;
        return true;
    }
    return false;
}

void add(ll &x, ll y) {
    x += y;
    if (x >= MOD) x -= MOD;
    if (x < 0) x += MOD;
}

void run();

#define TASK ""

int main() {
#ifdef LOCAL
    if (strlen(TASK) > 0) {
        cerr << "Reminder: you are using file i/o, filename: " TASK "!" << endl << endl;
    }
#endif
#ifndef LOCAL
    if (strlen(TASK)) {
        freopen(TASK ".in", "r", stdin);
        freopen(TASK ".out", "w", stdout);
    }
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
#endif
    cout << fixed << setprecision(12);
    run();
    return 0;
}

// == SOLUTION == //

#define double long double

const int N = 1 << 11;
const double EPS = 1e-10;

struct P {
	ll x, y, c;
};

int n;
P p[N];

struct Ev {
	int a, b;
	double ang;
	
	Ev(int a, int b) : a(a), b(b) {
		if (p[a].x == p[b].x) {
			ang = 1e10;
		} else {
			ang = (double) (p[a].y - p[b].y) / (p[a].x - p[b].x);
		}
	}
};

bool operator<(const Ev &u, const Ev &v) {
	/*if (u.ang + EPS < b.ang) {
		return 1;
	}
	if (u.ang - EPS > b.ang) {
		return 0;
	}
	*/
	return u.ang < v.ang;
}

struct Node {
	ll sum, res, left, right;
};

Node tree[2 * N + 13];

void upd(int i, ll val) {
	i += N;
	tree[i] = {val, max(0LL, val), max(0LL, val), max(0LL, val)};
	i /= 2;
	while (i > 0) {
		tree[i].sum = tree[2 * i].sum + tree[2 * i + 1].sum;
		tree[i].left = max(tree[2 * i].left, tree[2 * i].sum + tree[2 * i + 1].left);
		tree[i].right = max(tree[2 * i + 1].right, tree[2 * i + 1].sum + tree[2 * i].right);
		tree[i].res = max(tree[2 * i].right + tree[2 * i + 1].left, max(tree[2 * i].res, tree[2 * i + 1].res));
		i /= 2;
	}
}

ll get() {
	return tree[1].res;
}

int pos[N];

void make(const Ev &ev) {
	int a = pos[ev.a];
	int b = pos[ev.b];
	assert(a + 1 == b);
	swap(pos[ev.a], pos[ev.b]);
	ll va = tree[N + a].sum;
	ll vb = tree[N + b].sum;
	upd(a, vb);
	upd(b, va);
}

void run() {
	cin >> n;
	rep(i, 0, n) {
		cin >> p[i].x >> p[i].y >> p[i].c;
	}
	sort(p, p + n, [] (const auto &a, const auto &b) {
		return mp(a.x, a.y) < mp(b.x, b.y);
	});
	vector<Ev> events;
	events.reserve(n * (n - 1) / 2);
	rep(i, 0, n) {
		rep(j, i + 1, n) {
			events.pb(Ev(i, j));
		}
	}
	sort(all(events));
	
	ll ans = 0;
	rep(i, 0, n) {
		upd(i, p[i].c);
		pos[i] = i;
	}
	
	maxi(ans, get());
	
	rep(i, 0, sz(events)) {
		make(events[i]);
		int j = i;
		while (j + 1 < sz(events) && abs(events[j].ang - events[j + 1].ang) < EPS) {
			j++;
			make(events[j]);
		}
		
		maxi(ans, get());
		i = j;
	}
	
	cout << ans << "\n";
}

Compilation message

bulldozer.cpp: In function 'int main()':
bulldozer.cpp:67:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen(TASK ".in", "r", stdin);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bulldozer.cpp:68:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen(TASK ".out", "w", stdout);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 896 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 512 KB Output is correct
2 Correct 4 ms 512 KB Output is correct
3 Correct 4 ms 512 KB Output is correct
4 Correct 3 ms 512 KB Output is correct
5 Correct 3 ms 512 KB Output is correct
6 Correct 3 ms 512 KB Output is correct
7 Correct 3 ms 512 KB Output is correct
8 Correct 4 ms 512 KB Output is correct
9 Correct 3 ms 512 KB Output is correct
10 Correct 3 ms 512 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 2 ms 384 KB Output is correct
17 Correct 2 ms 384 KB Output is correct
18 Correct 2 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 3 ms 512 KB Output is correct
22 Correct 4 ms 512 KB Output is correct
23 Correct 4 ms 512 KB Output is correct
24 Correct 3 ms 512 KB Output is correct
25 Correct 4 ms 512 KB Output is correct
26 Correct 4 ms 512 KB Output is correct
27 Correct 3 ms 512 KB Output is correct
28 Correct 3 ms 512 KB Output is correct
29 Correct 4 ms 512 KB Output is correct
30 Correct 4 ms 640 KB Output is correct
31 Correct 3 ms 512 KB Output is correct
32 Correct 3 ms 512 KB Output is correct

Subtask #3
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 512 KB Output is correct
2 Correct 4 ms 512 KB Output is correct
3 Correct 4 ms 512 KB Output is correct
4 Correct 3 ms 512 KB Output is correct
5 Correct 3 ms 512 KB Output is correct
6 Correct 3 ms 512 KB Output is correct
7 Correct 3 ms 512 KB Output is correct
8 Correct 4 ms 512 KB Output is correct
9 Correct 3 ms 512 KB Output is correct
10 Correct 3 ms 512 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 2 ms 384 KB Output is correct
17 Correct 2 ms 384 KB Output is correct
18 Correct 2 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 3 ms 512 KB Output is correct
22 Correct 4 ms 512 KB Output is correct
23 Correct 4 ms 512 KB Output is correct
24 Correct 3 ms 512 KB Output is correct
25 Correct 4 ms 512 KB Output is correct
26 Correct 4 ms 512 KB Output is correct
27 Correct 3 ms 512 KB Output is correct
28 Correct 3 ms 512 KB Output is correct
29 Correct 4 ms 512 KB Output is correct
30 Correct 4 ms 640 KB Output is correct
31 Correct 3 ms 512 KB Output is correct
32 Correct 3 ms 512 KB Output is correct
33 Correct 771 ms 63160 KB Output is correct
34 Correct 751 ms 63176 KB Output is correct
35 Correct 789 ms 63096 KB Output is correct
36 Correct 776 ms 63096 KB Output is correct
37 Correct 792 ms 63164 KB Output is correct
38 Correct 798 ms 63172 KB Output is correct
39 Correct 779 ms 63164 KB Output is correct
40 Correct 793 ms 63164 KB Output is correct
41 Correct 758 ms 63096 KB Output is correct
42 Correct 822 ms 63228 KB Output is correct
43 Correct 814 ms 63164 KB Output is correct
44 Correct 804 ms 63096 KB Output is correct
45 Correct 759 ms 63164 KB Output is correct
46 Correct 768 ms 63096 KB Output is correct
47 Correct 747 ms 63096 KB Output is correct
48 Correct 771 ms 63168 KB Output is correct
49 Correct 752 ms 63096 KB Output is correct
50 Correct 751 ms 63168 KB Output is correct
51 Correct 743 ms 63224 KB Output is correct
52 Correct 747 ms 63176 KB Output is correct
53 Correct 749 ms 63176 KB Output is correct
54 Correct 746 ms 63236 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 512 KB Output is correct
2 Correct 4 ms 512 KB Output is correct
3 Correct 4 ms 512 KB Output is correct
4 Correct 3 ms 512 KB Output is correct
5 Correct 3 ms 512 KB Output is correct
6 Correct 3 ms 512 KB Output is correct
7 Correct 3 ms 512 KB Output is correct
8 Correct 4 ms 512 KB Output is correct
9 Correct 3 ms 512 KB Output is correct
10 Correct 3 ms 512 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 2 ms 384 KB Output is correct
17 Correct 2 ms 384 KB Output is correct
18 Correct 2 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 3 ms 512 KB Output is correct
22 Correct 4 ms 512 KB Output is correct
23 Correct 4 ms 512 KB Output is correct
24 Correct 3 ms 512 KB Output is correct
25 Correct 4 ms 512 KB Output is correct
26 Correct 4 ms 512 KB Output is correct
27 Correct 3 ms 512 KB Output is correct
28 Correct 3 ms 512 KB Output is correct
29 Correct 4 ms 512 KB Output is correct
30 Correct 4 ms 640 KB Output is correct
31 Correct 3 ms 512 KB Output is correct
32 Correct 3 ms 512 KB Output is correct
33 Correct 771 ms 63160 KB Output is correct
34 Correct 751 ms 63176 KB Output is correct
35 Correct 789 ms 63096 KB Output is correct
36 Correct 776 ms 63096 KB Output is correct
37 Correct 792 ms 63164 KB Output is correct
38 Correct 798 ms 63172 KB Output is correct
39 Correct 779 ms 63164 KB Output is correct
40 Correct 793 ms 63164 KB Output is correct
41 Correct 758 ms 63096 KB Output is correct
42 Correct 822 ms 63228 KB Output is correct
43 Correct 814 ms 63164 KB Output is correct
44 Correct 804 ms 63096 KB Output is correct
45 Correct 759 ms 63164 KB Output is correct
46 Correct 768 ms 63096 KB Output is correct
47 Correct 747 ms 63096 KB Output is correct
48 Correct 771 ms 63168 KB Output is correct
49 Correct 752 ms 63096 KB Output is correct
50 Correct 751 ms 63168 KB Output is correct
51 Correct 743 ms 63224 KB Output is correct
52 Correct 747 ms 63176 KB Output is correct
53 Correct 749 ms 63176 KB Output is correct
54 Correct 746 ms 63236 KB Output is correct
55 Correct 755 ms 63160 KB Output is correct
56 Correct 753 ms 63100 KB Output is correct
57 Correct 767 ms 63168 KB Output is correct
58 Correct 766 ms 63176 KB Output is correct
59 Correct 756 ms 63164 KB Output is correct
60 Correct 762 ms 63164 KB Output is correct
61 Correct 774 ms 63224 KB Output is correct
62 Correct 775 ms 63160 KB Output is correct
63 Correct 769 ms 63168 KB Output is correct
64 Correct 764 ms 63168 KB Output is correct
65 Correct 751 ms 63176 KB Output is correct
66 Correct 767 ms 63096 KB Output is correct
67 Correct 763 ms 63172 KB Output is correct
68 Correct 795 ms 63164 KB Output is correct
69 Correct 782 ms 63160 KB Output is correct
70 Correct 787 ms 63168 KB Output is correct
71 Correct 778 ms 63160 KB Output is correct
72 Correct 818 ms 63160 KB Output is correct
73 Correct 829 ms 63168 KB Output is correct
74 Correct 785 ms 63168 KB Output is correct

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 896 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -