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답안 #1079715

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1079715 2024-08-28T22:51:25 Z allin27x 송신탑 (IOI22_towers) C++17
14 / 100
 695 ms 11816 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long

const int MAXN = 1e5+4;

int n;
int h[MAXN];
int olc[MAXN], orc[MAXN];
int lc[MAXN],rc[MAXN];
int pr[MAXN];
int inited = 0;
int fl[MAXN];
int fr[MAXN];

int sum (int l, int r) {
	if (l > r) return 0;
	if (l==0) return pr[r];
	return pr[r] - pr[l-1];
}

int dfs(int i, int d){
	if (i==-1) return 0;
	if (lc[i]==-1 && rc[i]==-1) return -h[i];
	int lans = dfs(lc[i],d);
	int rans = dfs(rc[i],d);
	if (lans < 0 && h[i] - d >= -lans) lans = 1;
	if (rans < 0 && h[i] - d >= -rans) rans = 1;
	if (lans < 0) {
		lc[lc[i]] = -2; rc[lc[i]] = -2;
		lc[i] = -1;
	}
	if (rans < 0) {
		lc[rc[i]] = -2; rc[rc[i]] = -2;
		rc[i] = -1;
	}
	if (!lans) return rans; if (!rans) return lans;
	if (lans < 0 && rans < 0) return max(lans,rans);
	if (lans < 0) return rans;
	if (rans < 0) return lans;
	return lans + rans;
}

signed helper(int d){

	h[n] = 3e9;
	stack<int> st; st.push(n);
	for (int i=0; i<=n; i++) lc[i] = rc[i] = -1;

	for (int i=0; i<n; i++){
		int last = -1;
		while (h[i] > h[st.top()]) {
			last=st.top();
			st.pop();
		}
		lc[i] = last;
		rc[st.top()]=i;
		st.push(i);
	}
	for (int i=0; i<=n; i++) orc[i] =rc[i], olc[i] = lc[i];
	return dfs(n,d);
}


void init(signed N, std::vector<signed> H){
	n= N; for (int i = 0; i < N; i++) h[i] = H[i];
}

void init0(int d) {
	helper(d);
	pr[0] = (lc[0]==-1 && rc[0]==-1);
	for (int i=1; i<n; i++) pr[i] = pr[i-1] + (lc[i]==-1 && rc[i]==-1);
	int rs = 1e9;
	for (int i=n-1; i>=0; i--) {
		if (lc[i]!=-2) rs = i;
		fl[i] = rs;
	}
	rs = -1;
	for (int i=0; i<n; i++) {
		if (lc[i]!=-2) rs = i;
		fr[i] = rs;
	}
}


signed max_towers(signed l, signed r, signed d) {
	if (!inited) init0(d), inited = 1;
	int l1= l, r1=r;
	l = fl[l]; r = fr[r];
	if (r-l <= 1) return 1;
	int s = sum(l+1,r-1);
	s += rc[l] == -1 && (lc[l]!=-1 || olc[l] == -1 || (olc[l]!=-1 && lc[l] == -1 && olc[l] >= l1));
	s += lc[r] == -1 && (rc[r]!=-1 || orc[r] == -1 || (orc[r]!=-1 && rc[r] == -1 && orc[r] <= r1));
	return s;
}

Compilation message

towers.cpp: In function 'long long int dfs(long long int, long long int)':
towers.cpp:37:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   37 |  if (!lans) return rans; if (!rans) return lans;
      |  ^~
towers.cpp:37:26: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   37 |  if (!lans) return rans; if (!rans) return lans;
      |                          ^~

Subtask #1
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 293 ms 7532 KB 2nd lines differ - on the 1st token, expected: '1', found: '2'
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2392 KB Output is correct
3 Incorrect 1 ms 2392 KB 1st lines differ - on the 1st token, expected: '91', found: '92'
4 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2392 KB Output is correct
3 Incorrect 1 ms 2392 KB 1st lines differ - on the 1st token, expected: '91', found: '92'
4 Halted 0 ms 0 KB -

Subtask #4
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 466 ms 6868 KB Output is correct
2 Correct 668 ms 6864 KB Output is correct
3 Correct 695 ms 6864 KB Output is correct
4 Correct 659 ms 6864 KB Output is correct
5 Correct 651 ms 6864 KB Output is correct
6 Correct 612 ms 6864 KB Output is correct
7 Correct 643 ms 6864 KB Output is correct
8 Correct 599 ms 11728 KB Output is correct
9 Correct 620 ms 11816 KB Output is correct
10 Correct 626 ms 10448 KB Output is correct
11 Correct 607 ms 11212 KB Output is correct
12 Correct 640 ms 11728 KB Output is correct
13 Correct 635 ms 11816 KB Output is correct
14 Correct 1 ms 2392 KB Output is correct
15 Correct 1 ms 2648 KB Output is correct
16 Correct 1 ms 2648 KB Output is correct
17 Correct 13 ms 6864 KB Output is correct
18 Correct 12 ms 6852 KB Output is correct
19 Correct 11 ms 6864 KB Output is correct
20 Correct 13 ms 11808 KB Output is correct
21 Correct 14 ms 11472 KB Output is correct
22 Correct 13 ms 6856 KB Output is correct
23 Correct 11 ms 6864 KB Output is correct
24 Correct 12 ms 6888 KB Output is correct
25 Correct 13 ms 11816 KB Output is correct
26 Correct 13 ms 11216 KB Output is correct
27 Correct 1 ms 2464 KB Output is correct
28 Correct 1 ms 2392 KB Output is correct
29 Correct 1 ms 2392 KB Output is correct
30 Correct 1 ms 2648 KB Output is correct
31 Correct 1 ms 2648 KB Output is correct
32 Correct 1 ms 2392 KB Output is correct
33 Correct 1 ms 2392 KB Output is correct
34 Correct 1 ms 2392 KB Output is correct
35 Correct 1 ms 2648 KB Output is correct
36 Correct 1 ms 2648 KB Output is correct

Subtask #5
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 181 ms 3416 KB 2nd lines differ - on the 1st token, expected: '7063', found: '7197'
2 Halted 0 ms 0 KB -

Subtask #6
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2392 KB Output is correct
3 Incorrect 1 ms 2392 KB 1st lines differ - on the 1st token, expected: '91', found: '92'
4 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 293 ms 7532 KB 2nd lines differ - on the 1st token, expected: '1', found: '2'
2 Halted 0 ms 0 KB -