oj.uz

Submission #128016

# Submission time Handle Problem Language Result Execution time Memory
128016 2019-07-10T10:30:47 Z onjo0127 JOI15_aaqqz (JOI15_aaqqz) C++11
100 / 100
 1101 ms 9352 KB 
#include <bits/stdc++.h>
using namespace std;

int N, C, A[3009], U[3009], ans;
bool D[3009][3009];

void go(int s, int e) {
	if(s < 0 || N < e || s > e) return;
	
	int p = -1;
	vector<int> T;
	for(int i=s-1; i>=1; i--) {
		if(p == -1 || p <= A[i]) {
			T.push_back(A[i]);
			p = A[i];
		}
		else break;
	}
	
	int l = 0, r = (int)T.size() - 1;
	while(l <= r) {
		int m = l+r >> 1;
		vector<int> H(C+1, 0);
		for(int i=0; i<=m; i++) ++H[T[i]];
		int c = 0;
		bool f = 1, sr = 1;
		for(int i=e+1; i<=N && c<=m; i++) {
			if(H[A[i]]) {
				--H[A[i]];
				++c;
			}
			else {
				sr = 0;
				if(A[i] < T[m]) f = 0;
			}
		}
		f &= (c > m);

		if(f) {
			int L = s - m - 1, R = e + m + 1;
			if(sr) while(A[L-1] == A[R+1]) --L, ++R;
			ans = max(ans, R-L+1);
		}

		if(f) l = m+1;
		else r = m-1;
	}
}

void Do(int s, bool SR) {
	int p = -1;
	vector<int> T;
	for(int i=s-1; i>=1; i--) {
		if(p == -1 || p <= A[i]) {
			T.push_back(A[i]);
			p = A[i];
		}
		else break;
	}
	if(T.empty()) return;

	int mn = T[0];
	for(int i=s; i<=N; i++) if(T[0] > A[i]) {mn = A[i]; break;}

	int l = 0, r = (int)T.size() - 1;
	while(l <= r) {
		int m = l+r >> 1;
		vector<int> H(C+1, 0);
		for(int i=0; i<=m; i++) ++H[T[i]];
		int c = 0, mnc = 0;
		bool f = 1, sr = 1;
		for(int i=s; i<=N; i++) {
			if(H[A[i]]) {
				--H[A[i]];
				++c;
			}
			else if(A[i] == mn) ++mnc;
			else {
				if(sr && SR && c > m) break;
				sr = 0;
				if(A[i] < T[m]) break;
			}
		}
		f &= (c > m);

		if(f) {
			int L = s - m - 1, R = s + m + mnc;
			// printf("[%d, %d]\n", L, R);
			if(sr) while(A[L-1] == A[R+1]) --L, ++R;
			// printf("s: %d, SR: %d, sr: %d, m: %d, [%d, %d]\n", s, SR, sr, m, L, R);
			ans = max(ans, R-L+1);
		}

		if(f) l = m+1;
		else r = m-1;
	}
}

void solve() {
	for(int i=N; i>=1; i--) {
		for(int j=i; j<=N; j++) {
			if(i+1 >= j && A[i] == A[j]) D[i][j] = 1;
			else if(D[i+1][j-1] && A[i] == A[j]) D[i][j] = 1;
			else D[i][j] = 0;
			if(D[i][j]) ans = max(ans, j-i+1);
		}
	}
	for(int i=1; i<=N; i++) {
		int l = i, r = i;
		while(D[l-1][r+1]) --l, ++r;
		go(l, r);
		l = i, r = i-1;
		while(D[l-1][r+1]) --l, ++r;
		go(l, r);
		Do(i, 0);
		Do(i, 1);
	}
}

int main() {
	scanf("%d%d",&N,&C);
	A[0] = 1e9;
	for(int i=1; i<=N; i++) {
		scanf("%d",&A[i]);
		++U[A[i]];
	}
	for(int i=1; i<=C; i++) ans = max(ans, U[i]);
	solve();
	reverse(A+1, A+N+1);
	for(int i=1; i<=N; i++) A[i] = C - A[i] + 1;
	solve();
	printf("%d", ans);
	return 0;
}

Compilation message

aaqqz.cpp: In function 'void go(int, int)':
aaqqz.cpp:22:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m = l+r >> 1;
           ~^~
aaqqz.cpp: In function 'void Do(int, bool)':
aaqqz.cpp:67:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m = l+r >> 1;
           ~^~
aaqqz.cpp: In function 'int main()':
aaqqz.cpp:121:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&N,&C);
  ~~~~~^~~~~~~~~~~~~~
aaqqz.cpp:124:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&A[i]);
   ~~~~~^~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 508 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 504 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 504 KB Output is correct
6 Correct 2 ms 504 KB Output is correct
7 Correct 2 ms 504 KB Output is correct
8 Correct 2 ms 504 KB Output is correct
9 Correct 2 ms 508 KB Output is correct
10 Correct 2 ms 504 KB Output is correct
11 Correct 2 ms 504 KB Output is correct
12 Correct 2 ms 504 KB Output is correct
13 Correct 2 ms 504 KB Output is correct
14 Correct 2 ms 504 KB Output is correct
15 Correct 2 ms 504 KB Output is correct
16 Correct 2 ms 504 KB Output is correct
17 Correct 2 ms 504 KB Output is correct
18 Correct 3 ms 504 KB Output is correct
19 Correct 2 ms 504 KB Output is correct
20 Correct 2 ms 528 KB Output is correct
21 Correct 2 ms 504 KB Output is correct
22 Correct 2 ms 504 KB Output is correct
23 Correct 2 ms 504 KB Output is correct
24 Correct 2 ms 504 KB Output is correct
25 Correct 2 ms 504 KB Output is correct
26 Correct 2 ms 504 KB Output is correct
27 Correct 2 ms 376 KB Output is correct
28 Correct 2 ms 504 KB Output is correct
29 Correct 2 ms 504 KB Output is correct
30 Correct 2 ms 504 KB Output is correct
31 Correct 2 ms 504 KB Output is correct
32 Correct 2 ms 504 KB Output is correct
33 Correct 2 ms 504 KB Output is correct
34 Correct 2 ms 504 KB Output is correct
35 Correct 2 ms 504 KB Output is correct
36 Correct 2 ms 504 KB Output is correct
37 Correct 2 ms 504 KB Output is correct

Subtask #2
90.0 / 90.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 508 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 504 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 504 KB Output is correct
6 Correct 2 ms 504 KB Output is correct
7 Correct 2 ms 504 KB Output is correct
8 Correct 2 ms 504 KB Output is correct
9 Correct 2 ms 508 KB Output is correct
10 Correct 2 ms 504 KB Output is correct
11 Correct 2 ms 504 KB Output is correct
12 Correct 2 ms 504 KB Output is correct
13 Correct 2 ms 504 KB Output is correct
14 Correct 2 ms 504 KB Output is correct
15 Correct 2 ms 504 KB Output is correct
16 Correct 2 ms 504 KB Output is correct
17 Correct 2 ms 504 KB Output is correct
18 Correct 3 ms 504 KB Output is correct
19 Correct 2 ms 504 KB Output is correct
20 Correct 2 ms 528 KB Output is correct
21 Correct 2 ms 504 KB Output is correct
22 Correct 2 ms 504 KB Output is correct
23 Correct 2 ms 504 KB Output is correct
24 Correct 2 ms 504 KB Output is correct
25 Correct 2 ms 504 KB Output is correct
26 Correct 2 ms 504 KB Output is correct
27 Correct 2 ms 376 KB Output is correct
28 Correct 2 ms 504 KB Output is correct
29 Correct 2 ms 504 KB Output is correct
30 Correct 2 ms 504 KB Output is correct
31 Correct 2 ms 504 KB Output is correct
32 Correct 2 ms 504 KB Output is correct
33 Correct 2 ms 504 KB Output is correct
34 Correct 2 ms 504 KB Output is correct
35 Correct 2 ms 504 KB Output is correct
36 Correct 2 ms 504 KB Output is correct
37 Correct 2 ms 504 KB Output is correct
38 Correct 70 ms 9208 KB Output is correct
39 Correct 55 ms 9208 KB Output is correct
40 Correct 55 ms 9208 KB Output is correct
41 Correct 190 ms 9212 KB Output is correct
42 Correct 190 ms 9208 KB Output is correct
43 Correct 80 ms 9248 KB Output is correct
44 Correct 79 ms 9236 KB Output is correct
45 Correct 98 ms 9284 KB Output is correct
46 Correct 98 ms 9252 KB Output is correct
47 Correct 104 ms 9264 KB Output is correct
48 Correct 104 ms 9336 KB Output is correct
49 Correct 103 ms 9180 KB Output is correct
50 Correct 103 ms 9208 KB Output is correct
51 Correct 114 ms 9352 KB Output is correct
52 Correct 113 ms 9208 KB Output is correct
53 Correct 70 ms 9208 KB Output is correct
54 Correct 71 ms 9208 KB Output is correct
55 Correct 1101 ms 9268 KB Output is correct
56 Correct 105 ms 9208 KB Output is correct
57 Correct 106 ms 9308 KB Output is correct
58 Correct 125 ms 9208 KB Output is correct
59 Correct 125 ms 9336 KB Output is correct
60 Correct 85 ms 9208 KB Output is correct
61 Correct 85 ms 9208 KB Output is correct
62 Correct 111 ms 9208 KB Output is correct
63 Correct 111 ms 9208 KB Output is correct
64 Correct 103 ms 9336 KB Output is correct
65 Correct 103 ms 9244 KB Output is correct
66 Correct 109 ms 9208 KB Output is correct
67 Correct 113 ms 9208 KB Output is correct