oj.uz

Submission #122767

# Submission time Handle Problem Language Result Execution time Memory
122767 2019-06-29T09:05:54 Z WhipppedCream Two Antennas (JOI19_antennas) C++17
22 / 100
 438 ms 29256 KB 
#include <bits/stdc++.h>
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
using namespace std;
#define X first
#define Y second
#define pb push_back
typedef pair<int, int> ii;
typedef long long ll;

const int maxn = 2e5+5;

int n, q;

int H[maxn], A[maxn], B[maxn];
int ql[maxn], qr[maxn];

int res[maxn];

vector<int> buck[maxn];
vector<int> que[maxn];

int tmp[maxn];

struct segtree
{
	struct node
	{
		int a = -1, b = 1e9;
		int res = -1;
	};
	node st[4*maxn];
	void clear()
	{
		for(int i = 1; i<= 4*n; i++) st[i] = node();
	}
	void build(int *arr, int p = 1, int L = 1, int R = n)
	{
		if(L == R)
		{
			st[p].a = arr[L];
			return;
		}
		int M = (L+R)/2;
		build(arr, 2*p, L, M);
		build(arr, 2*p+1, M+1, R);
	}
	void modb(int p, int x)
	{
		st[p].b = min(st[p].b, x);
		st[p].res = max(st[p].res, st[p].a-st[p].b);
	}
	void push(int p)
	{
        modb(2*p, st[p].b);
        modb(2*p+1, st[p].b);
        st[p].b = 1e9;
	}
	void update(int p)
	{
		st[p].a = max(st[2*p].a, st[2*p+1].a);
		st[p].res = max(max(st[p].res, st[2*p].res), max(st[2*p+1].res, st[p].a-st[p].b));
	}
	void rngb(int i, int j, int dx, int p = 1, int L = 1, int R = n)
	{
		if(i> R || j< L) return;
		if(i<= L && R<= j)
		{
			modb(p, dx);
			return;
		}
		push(p);
		int M = (L+R)/2;
		rngb(i, j, dx, 2*p, L, M);
		rngb(i, j, dx, 2*p+1, M+1, R);
		update(p);
	}
	void pointa(int x, int dx, int p = 1, int L = 1, int R = n)
	{
		if(L == R)
		{
			st[p].a += dx;
			st[p].b = 1e9;
			return;
		}
		push(p);
		int M = (L+R)/2;
		if(x<= M) pointa(x, dx, 2*p, L, M);
		else pointa(x, dx, 2*p+1, M+1, R);
		update(p);
	}
	int ask(int i, int j, int p = 1, int L = 1, int R = n)
	{
		if(i> R || j< L) return -1;
		if(i<= L && R<= j) return st[p].res;
		push(p);
		int M = (L+R)/2;
		int x = ask(i, j, 2*p, L, M);
		int y = ask(i, j, 2*p+1, M+1, R);
		return max(x, y);
	}
};

segtree foo;

void solve()
{
	foo.clear();
	for(int i = 1; i<= n; i++) buck[i].clear();
	for(int i = 1; i<= n; i++) que[i].clear();
	for(int i = 1; i<= n; i++)
	{
		buck[max(0, i-A[i])].pb(i);
		buck[max(0, i-B[i]-1)].pb(-i);
	}
	for(int i = 1; i<= q; i++)
	{
		que[ql[i]].pb(i);
	}
	for(int i = 1; i<= n; i++) tmp[i] = H[i]-1e9;
	foo.build(tmp);
	for(int i = n; i>= 1; i--)
	{
		for(int x : buck[i])
		{
			if(x> 0) foo.pointa(x, 1e9);
			else foo.pointa(-x, -1e9);
		}
		foo.rngb(min(i+A[i], n), min(i+B[i], n), H[i]);
		for(int k : que[i])
		{
			res[k] = max(res[k], foo.ask(ql[k], qr[k]));
		}
	}
}

int main()
{
	scanf("%d", &n);
	for(int i = 1; i<= n; i++)
	{
		scanf("%d %d %d", &H[i], &A[i], &B[i]);
	}
	scanf("%d", &q);
	for(int i = 1; i<= q; i++)
	{
		scanf("%d %d", &ql[i], &qr[i]);
	}
	memset(res, -1, sizeof res);
	solve();
	reverse(H+1, H+n+1);
	reverse(A+1, A+n+1);
	reverse(B+1, B+n+1);
    for(int i = 1; i<= q; i++)
    {
    	int l = ql[i], r = qr[i];
    	ql[i] = n+1-r;
    	qr[i] = n+1-l;
    }
    solve();
    for(int i = 1; i<= q; i++) printf("%d\n", res[i]);
}

Compilation message

antennas.cpp: In function 'int main()':
antennas.cpp:139:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
antennas.cpp:142:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d", &H[i], &A[i], &B[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
antennas.cpp:144:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &q);
  ~~~~~^~~~~~~~~~
antennas.cpp:147:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &ql[i], &qr[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 2.0

# Verdict Execution time Memory Grader output
1 Incorrect 11 ms 10616 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 11 ms 10616 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 390 ms 27236 KB Output is correct
2 Correct 438 ms 29064 KB Output is correct
3 Correct 291 ms 23616 KB Output is correct
4 Correct 419 ms 29156 KB Output is correct
5 Correct 184 ms 19092 KB Output is correct
6 Correct 427 ms 29256 KB Output is correct
7 Correct 362 ms 26608 KB Output is correct
8 Correct 425 ms 29088 KB Output is correct
9 Correct 61 ms 13576 KB Output is correct
10 Correct 435 ms 29148 KB Output is correct
11 Correct 257 ms 22412 KB Output is correct
12 Correct 434 ms 29012 KB Output is correct
13 Correct 302 ms 27844 KB Output is correct
14 Correct 293 ms 27592 KB Output is correct
15 Correct 291 ms 26780 KB Output is correct
16 Correct 270 ms 26956 KB Output is correct
17 Correct 303 ms 28188 KB Output is correct
18 Correct 292 ms 27164 KB Output is correct
19 Correct 296 ms 27276 KB Output is correct
20 Correct 292 ms 27684 KB Output is correct
21 Correct 288 ms 27968 KB Output is correct
22 Correct 285 ms 27560 KB Output is correct
23 Correct 293 ms 27376 KB Output is correct
24 Correct 272 ms 26616 KB Output is correct

Subtask #4
0 / 65.0

# Verdict Execution time Memory Grader output
1 Incorrect 11 ms 10616 KB Output isn't correct
2 Halted 0 ms 0 KB -