oj.uz

Submission #122686

# Submission time Handle Problem Language Result Execution time Memory
122686 2019-06-29T06:43:49 Z 이온조(#2999) Bulldozer (JOI17_bulldozer) C++14
5 / 100
 104 ms 95176 KB 
#include <bits/stdc++.h>
using namespace std;
using pii = pair<int, int>;
#define X first
#define Y second

struct info { int x, y, v; };
struct node { long long ls, rs, mx, s; };
node operator +(node L, node R) {
	node ret;
	ret.s = L.s + R.s;
	ret.ls = max(L.ls, L.s + R.ls);
	ret.rs = max(R.rs, R.s + L.rs);
	ret.mx = max({L.mx, R.mx, L.rs + R.ls, ret.s});
	return ret;
}
const long long INF = 1LL * 1e18;
const node MINF = {0, 0, 0, -INF};

struct segtree {
	vector<node> T;
	node get(int idx, int s, int e, int l, int r) {
		if(r < s || e < l) return MINF;
		if(l <= s && e <= r) return T[idx];
		int m = s+e >> 1;
		return get(idx*2, s, m, l, r) + get(idx*2+1, m+1, e, l, r);
	}
	void upd(int idx, int s, int e, int p, int v) {
		if(p < s || e < p) return;
		if(s == e) {
			int x = max(0, v);
			T[idx] = {x, x, x, v};
			return;
		}
		int m = s+e >> 1;
		upd(idx*2, s, m, p, v);
		upd(idx*2+1, m+1, e, p, v);
		T[idx] = T[idx*2] + T[idx*2+1];
	}
	segtree(int N) {
		T.resize(4*N);
	}
};

inline int f(int x) { return max(x, -x); }

inline int CCW(pii A, pii B, pii C) {
	long long tmp = 1LL*A.X*B.Y + 1LL*B.X*C.Y + 1LL*C.X*A.Y - 1LL*B.X*A.Y - 1LL*C.X*B.Y - 1LL*A.X*C.Y;
	if(tmp < 0LL) return -1;
	if(tmp == 0LL) return 0;
	if(tmp > 0LL) return +1;
}

inline int CCW(info A, info B, info C) {
	return CCW((pii){A.x, A.y}, (pii){B.x, B.y}, (pii){C.x, C.y});
}

inline pii ch(int dx, int dy) {
	if(dx == 0) dy /= f(dy);
	else if(dy == 0) dx /= f(dx);
	else {
		int gcd = __gcd(f(dx), f(dy));
		dx /= gcd; dy /= gcd;
	}
	return {dx, dy};
}

map<pii, int> id;
vector<vector<int> > RQ[4000009];
bool chk[2009][2009];
int O[2009], R[2009];
info A[2009];

int main() {
	int N; scanf("%d",&N);
	for(int i=1; i<=N; i++) {
		scanf("%d%d%d", &A[i].x, &A[i].y, &A[i].v);
	}
	vector<pii> S;
	for(int i=1; i<=N; i++) {
		for(int j=1; j<=N; j++) {
			int dx = A[j].x - A[i].x, dy = A[j].y - A[i].y;
			if(dx < 0 || (dx == 0 && dy <= 0)) continue;
			tie(dx, dy) = ch(dx, dy);
			S.push_back({dx, dy});
		}
	}
	sort(S.begin(), S.end(), [&](pii P, pii Q) { return CCW({0, 0}, P, Q) == -1; });
	for(int i=0, c=0; i<S.size(); i++) {
		if(!i || CCW({0, 0}, S[i-1], S[i]) == -1) {
			// printf("dx: %d, dy: %d\n", S[i].first, S[i].second);
			id[S[i]] = ++c;
		}
	}
	for(int i=1; i<=N; i++) {
		vector<int> T;
		for(int j=1; j<=N; j++) {
			int dx = A[j].x - A[i].x, dy = A[j].y - A[i].y;
			if(dx < 0 || (dx == 0 && dy <= 0)) continue;
			T.push_back(j);
		}
		sort(T.begin(), T.end(), [&](int P, int Q) { return CCW(A[i], A[P], A[Q]) == -1; });
		vector<int> P = {i}; int pr = -1, pid = -1;
		for(int j=0; j<T.size(); j++) {
			int it = T[j];
			int dx = A[it].x - A[i].x, dy = A[it].y - A[i].y;
			int idx = id[ch(dx, dy)];
			if(chk[i][it]) continue;
			if(pr == -1 || CCW(A[i], A[pr], A[it]) == 0) {
				P.push_back(it);
				pr = it;
			}
			else {
				RQ[pid].push_back(P);
				for(auto& p: P) for(auto& q: P) chk[p][q] = 1;
				P = {i, it};
				pr = it;
			}
			pid = idx;
		}
		if(pid != -1) {
			RQ[pid].push_back(P);
			for(auto& p: P) for(auto& q: P) chk[p][q] = 1;
		}
	}
	for(int i=1; i<=N; i++) O[i] = i;
	sort(O+1, O+N+1, [&](int P, int Q) { return (pii){A[P].x, A[P].y} < (pii){A[Q].x, A[Q].y}; });
	segtree seg(N);
	long long ans = 0;
	for(int i=1; i<=N; i++) {
		int it = O[i];
		R[it] = i;
		seg.upd(1, 1, N, i, A[it].v);
	}
	// puts("O");
	// for(int i=1; i<=N; i++) printf("%d ",O[i]);
	// puts("");
	ans = seg.get(1, 1, N, 1, N).mx;
	printf("%lld", ans);
	return 0;
	for(int i=1; i<=S.size(); i++) {
		for(auto& it: RQ[i]) {
			// printf("i: %d, it: ", i);
			// for(auto& jt: it) printf("%d ", jt);
			// puts("");
			sort(it.begin(), it.end(), [&](int P, int Q) { return R[P] < R[Q]; });
			int K = it.size();
			for(int j=0; j<K; j++) seg.upd(1, 1, N, R[it[j]], A[it[K-j-1]].v);
			for(int j=0; j<K/2; j++) {
				int p = it[j], q = it[K-j-1];
				swap(O[R[p]], O[R[q]]);
				swap(R[p], R[q]);
			}
			// puts("O");
			// for(int i=1; i<=N; i++) printf("%d ",O[i]);
			// puts("");
		}
		// printf("getans: %lld\n", seg.get(1, 1, N, 1, N).mx);
		ans = max(ans, seg.get(1, 1, N, 1, N).mx);
	}
	printf("%lld", ans);
	return 0;
}

Compilation message

bulldozer.cpp: In member function 'node segtree::get(int, int, int, int, int)':
bulldozer.cpp:25:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m = s+e >> 1;
           ~^~
bulldozer.cpp: In member function 'void segtree::upd(int, int, int, int, int)':
bulldozer.cpp:35:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m = s+e >> 1;
           ~^~
bulldozer.cpp: In function 'int main()':
bulldozer.cpp:89:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0, c=0; i<S.size(); i++) {
                    ~^~~~~~~~~
bulldozer.cpp:104:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=0; j<T.size(); j++) {
                ~^~~~~~~~~
bulldozer.cpp:141:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1; i<=S.size(); i++) {
               ~^~~~~~~~~~
bulldozer.cpp:75:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int N; scanf("%d",&N);
         ~~~~~^~~~~~~~~
bulldozer.cpp:77:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d", &A[i].x, &A[i].y, &A[i].v);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bulldozer.cpp: In function 'int CCW(pii, pii, pii)':
bulldozer.cpp:52:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 84 ms 94584 KB Output is correct
2 Correct 96 ms 94624 KB Output is correct
3 Correct 104 ms 94584 KB Output is correct
4 Correct 85 ms 94604 KB Output is correct
5 Correct 84 ms 94584 KB Output is correct
6 Correct 85 ms 94712 KB Output is correct
7 Correct 84 ms 94584 KB Output is correct
8 Correct 85 ms 94712 KB Output is correct
9 Correct 86 ms 94584 KB Output is correct
10 Correct 85 ms 94716 KB Output is correct
11 Correct 84 ms 94328 KB Output is correct
12 Correct 84 ms 94216 KB Output is correct
13 Correct 85 ms 94328 KB Output is correct
14 Correct 83 ms 94200 KB Output is correct
15 Correct 84 ms 94200 KB Output is correct

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 90 ms 95176 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 35.0

# Verdict Execution time Memory Grader output
1 Incorrect 90 ms 95176 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 90 ms 95176 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 84 ms 94584 KB Output is correct
2 Correct 96 ms 94624 KB Output is correct
3 Correct 104 ms 94584 KB Output is correct
4 Correct 85 ms 94604 KB Output is correct
5 Correct 84 ms 94584 KB Output is correct
6 Correct 85 ms 94712 KB Output is correct
7 Correct 84 ms 94584 KB Output is correct
8 Correct 85 ms 94712 KB Output is correct
9 Correct 86 ms 94584 KB Output is correct
10 Correct 85 ms 94716 KB Output is correct
11 Correct 84 ms 94328 KB Output is correct
12 Correct 84 ms 94216 KB Output is correct
13 Correct 85 ms 94328 KB Output is correct
14 Correct 83 ms 94200 KB Output is correct
15 Correct 84 ms 94200 KB Output is correct
16 Incorrect 90 ms 95176 KB Output isn't correct
17 Halted 0 ms 0 KB -