oj.uz

Submission #122721

# Submission time Handle Problem Language Result Execution time Memory
122721 2019-06-29T07:36:09 Z 이온조(#2999) Bulldozer (JOI17_bulldozer) C++14
25 / 100
 2000 ms 129744 KB 
#include <bits/stdc++.h>
using namespace std;
using pii = pair<int, int>;
using pvi = pair<pii, vector<int> >;
#define X first
#define Y second

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;
}

struct myp { int x, y; };
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;
}
bool operator <(myp P, myp Q) {
	return CCW({0, 0}, {P.x, P.y}, {Q.x, Q.y}) == -1;
}
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(info A, info B, info C) {
	return CCW((pii){A.x, A.y}, (pii){B.x, B.y}, (pii){C.x, C.y});
}

inline long long dst(pii A, pii B) {
	return 1LL * (A.X - B.X) * (A.X - B.X) + 1LL * (A.Y - B.Y) * (A.Y - B.Y);
}

vector<pvi> RQ;
bool chk[2009][2009];
int O[2009], R[2009], idx[2009][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);
	}

	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}; });
	for(int oi=1; oi<=N; oi++) {
		int i = O[oi];
		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) {
			int ccw = CCW(A[i], A[P], A[Q]);
			if(ccw == 0) return dst({A[i].x, A[i].y}, {A[P].x, A[P].y}) < dst({A[i].x, A[i].y}, {A[Q].x, A[Q].y});
			return ccw == -1;
		});
		vector<int> P = {i}; int pr = -1, pdx = -1, pdy = -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;

			if(chk[i][it]) continue;
			if(pr == -1 || CCW(A[i], A[pr], A[it]) == 0) {
				P.push_back(it);
				pr = it;
			}
			else {
				RQ.push_back({{pdx, pdy}, P});
				for(auto& p: P) for(auto& q: P) {
					if(p == q) continue;
					// printf("i: %d p: %d q: %d\n", i, p, q);
					assert(!chk[p][q]);
					chk[p][q] = 1;
				}
				P = {i, it};
				pr = it;
			}
			pdx = dx; pdy = dy;
		}
		if(pdx != -1) {
			RQ.push_back({{pdx, pdy}, P});
			for(auto& p: P) for(auto& q: P) {
				if(p == q) continue;
				// printf("i: %d p: %d q: %d\n", i, p, q);
				assert(!chk[p][q]);
				chk[p][q] = 1;
			}
		}
	}
	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;
	sort(RQ.begin(), RQ.end(), [&](pvi P, pvi Q) {
		int pdx, pdy; tie(pdx, pdy) = P.first;
		int qdx, qdy; tie(qdx, qdy) = Q.first;
		if((pdx == 0) != (qdx == 0)) return (pdx == 0) > (qdx == 0);
		return 1LL * pdy * qdx > 1LL * qdy * pdx;
	});
	int pdx = 0, pdy = 0;
	for(auto& kt: RQ) {
		vector<int> it = kt.second;

		// printf("it: ");
		// for(auto& jt: it) printf("%d ", jt);
		// puts("");
		int dx, dy; tie(dx, dy) = kt.first;
		
		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("");

		if(pdx != 0 && pdy != 0 && ((pdx == 0 && dx != 0) || 1LL * pdy * dx != 1LL * dy * pdx)) {
			// printf("getans: %lld\n", seg.get(1, 1, N, 1, N).mx);
			ans = max(ans, seg.get(1, 1, N, 1, N).mx);
		}
		pdx = dx; pdy = dy;
	}
	printf("%lld", ans);
	return 0;
}

Compilation message

bulldozer.cpp: In member function 'node segtree::get(int, int, int, int, int)':
bulldozer.cpp:37:12: 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:47:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m = s+e >> 1;
           ~^~
bulldozer.cpp: In function 'int main()':
bulldozer.cpp:94:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=0; j<T.size(); j++) {
                ~^~~~~~~~~
bulldozer.cpp: In function 'int CCW(pii, pii, pii)':
bulldozer.cpp:13:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
bulldozer.cpp: In function 'int main()':
bulldozer.cpp:73:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int N; scanf("%d",&N);
         ~~~~~^~~~~~~~~
bulldozer.cpp:75:8: 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);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 504 KB Output is correct
2 Correct 3 ms 504 KB Output is correct
3 Correct 3 ms 632 KB Output is correct
4 Correct 3 ms 504 KB Output is correct
5 Correct 3 ms 632 KB Output is correct
6 Correct 3 ms 632 KB Output is correct
7 Correct 3 ms 504 KB Output is correct
8 Correct 3 ms 504 KB Output is correct
9 Correct 3 ms 504 KB Output is correct
10 Correct 3 ms 504 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 256 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 888 KB Output is correct
2 Correct 11 ms 892 KB Output is correct
3 Correct 11 ms 888 KB Output is correct
4 Correct 11 ms 888 KB Output is correct
5 Correct 11 ms 888 KB Output is correct
6 Correct 11 ms 1016 KB Output is correct
7 Correct 11 ms 888 KB Output is correct
8 Correct 11 ms 888 KB Output is correct
9 Correct 11 ms 888 KB Output is correct
10 Correct 11 ms 888 KB Output is correct
11 Correct 2 ms 256 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 2 ms 380 KB Output is correct
17 Correct 2 ms 376 KB Output is correct
18 Correct 2 ms 376 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 2 ms 376 KB Output is correct
21 Correct 11 ms 1016 KB Output is correct
22 Correct 11 ms 888 KB Output is correct
23 Correct 11 ms 888 KB Output is correct
24 Correct 11 ms 888 KB Output is correct
25 Correct 11 ms 888 KB Output is correct
26 Correct 11 ms 888 KB Output is correct
27 Correct 11 ms 888 KB Output is correct
28 Correct 11 ms 892 KB Output is correct
29 Correct 11 ms 888 KB Output is correct
30 Correct 11 ms 892 KB Output is correct
31 Correct 11 ms 888 KB Output is correct
32 Correct 11 ms 888 KB Output is correct

Subtask #3
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 888 KB Output is correct
2 Correct 11 ms 892 KB Output is correct
3 Correct 11 ms 888 KB Output is correct
4 Correct 11 ms 888 KB Output is correct
5 Correct 11 ms 888 KB Output is correct
6 Correct 11 ms 1016 KB Output is correct
7 Correct 11 ms 888 KB Output is correct
8 Correct 11 ms 888 KB Output is correct
9 Correct 11 ms 888 KB Output is correct
10 Correct 11 ms 888 KB Output is correct
11 Correct 2 ms 256 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 2 ms 380 KB Output is correct
17 Correct 2 ms 376 KB Output is correct
18 Correct 2 ms 376 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 2 ms 376 KB Output is correct
21 Correct 11 ms 1016 KB Output is correct
22 Correct 11 ms 888 KB Output is correct
23 Correct 11 ms 888 KB Output is correct
24 Correct 11 ms 888 KB Output is correct
25 Correct 11 ms 888 KB Output is correct
26 Correct 11 ms 888 KB Output is correct
27 Correct 11 ms 888 KB Output is correct
28 Correct 11 ms 892 KB Output is correct
29 Correct 11 ms 888 KB Output is correct
30 Correct 11 ms 892 KB Output is correct
31 Correct 11 ms 888 KB Output is correct
32 Correct 11 ms 888 KB Output is correct
33 Execution timed out 2032 ms 129744 KB Time limit exceeded
34 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 888 KB Output is correct
2 Correct 11 ms 892 KB Output is correct
3 Correct 11 ms 888 KB Output is correct
4 Correct 11 ms 888 KB Output is correct
5 Correct 11 ms 888 KB Output is correct
6 Correct 11 ms 1016 KB Output is correct
7 Correct 11 ms 888 KB Output is correct
8 Correct 11 ms 888 KB Output is correct
9 Correct 11 ms 888 KB Output is correct
10 Correct 11 ms 888 KB Output is correct
11 Correct 2 ms 256 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 2 ms 380 KB Output is correct
17 Correct 2 ms 376 KB Output is correct
18 Correct 2 ms 376 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 2 ms 376 KB Output is correct
21 Correct 11 ms 1016 KB Output is correct
22 Correct 11 ms 888 KB Output is correct
23 Correct 11 ms 888 KB Output is correct
24 Correct 11 ms 888 KB Output is correct
25 Correct 11 ms 888 KB Output is correct
26 Correct 11 ms 888 KB Output is correct
27 Correct 11 ms 888 KB Output is correct
28 Correct 11 ms 892 KB Output is correct
29 Correct 11 ms 888 KB Output is correct
30 Correct 11 ms 892 KB Output is correct
31 Correct 11 ms 888 KB Output is correct
32 Correct 11 ms 888 KB Output is correct
33 Execution timed out 2032 ms 129744 KB Time limit exceeded
34 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 504 KB Output is correct
2 Correct 3 ms 504 KB Output is correct
3 Correct 3 ms 632 KB Output is correct
4 Correct 3 ms 504 KB Output is correct
5 Correct 3 ms 632 KB Output is correct
6 Correct 3 ms 632 KB Output is correct
7 Correct 3 ms 504 KB Output is correct
8 Correct 3 ms 504 KB Output is correct
9 Correct 3 ms 504 KB Output is correct
10 Correct 3 ms 504 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 256 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 11 ms 888 KB Output is correct
17 Correct 11 ms 892 KB Output is correct
18 Correct 11 ms 888 KB Output is correct
19 Correct 11 ms 888 KB Output is correct
20 Correct 11 ms 888 KB Output is correct
21 Correct 11 ms 1016 KB Output is correct
22 Correct 11 ms 888 KB Output is correct
23 Correct 11 ms 888 KB Output is correct
24 Correct 11 ms 888 KB Output is correct
25 Correct 11 ms 888 KB Output is correct
26 Correct 2 ms 256 KB Output is correct
27 Correct 2 ms 376 KB Output is correct
28 Correct 2 ms 376 KB Output is correct
29 Correct 2 ms 376 KB Output is correct
30 Correct 2 ms 376 KB Output is correct
31 Correct 2 ms 380 KB Output is correct
32 Correct 2 ms 376 KB Output is correct
33 Correct 2 ms 376 KB Output is correct
34 Correct 2 ms 376 KB Output is correct
35 Correct 2 ms 376 KB Output is correct
36 Correct 11 ms 1016 KB Output is correct
37 Correct 11 ms 888 KB Output is correct
38 Correct 11 ms 888 KB Output is correct
39 Correct 11 ms 888 KB Output is correct
40 Correct 11 ms 888 KB Output is correct
41 Correct 11 ms 888 KB Output is correct
42 Correct 11 ms 888 KB Output is correct
43 Correct 11 ms 892 KB Output is correct
44 Correct 11 ms 888 KB Output is correct
45 Correct 11 ms 892 KB Output is correct
46 Correct 11 ms 888 KB Output is correct
47 Correct 11 ms 888 KB Output is correct
48 Execution timed out 2032 ms 129744 KB Time limit exceeded
49 Halted 0 ms 0 KB -