Submission #36180

#	Time	Username	Problem	Language	Result	Execution time	Memory
36180		UncleGrandpa925	Longest beautiful sequence (IZhO17_subsequence)	C++14	100 / 100	4549 ms	48776 KiB

subsequence

/*input
4
1 2 3 4
10 0 1 0
5
5 3 5 3 5
10 1 20 1 20

*/
#include <bits/stdc++.h>
using namespace std;
#define sp ' '
#define endl '\n'
#define fi first
#define se second
#define mp make_pair
#define N 100005
#define M 1024
#define bit(x,y) ((x>>y)&1LL)

int n;
int a[N], b[N], cnt[M];
int dp[N], par[N];
int g[M][M][11];
vector<int> order;
signed main() {
// #ifdef in1code
// 	freopen("1test.inp", "r", stdin);
// #endif
	scanf("%d", &n);
	for (int i = 1; i <= n; i++) scanf("%d", &a[i]);
	for (int i = 1; i <= n; i++) scanf("%d", &b[i]);
	for (int i = 0; i < M; i++) cnt[i] = __builtin_popcount(i);
	memset(g, 0, sizeof(g));
	pair<int, int> ans = mp(1, 1);
	for (int i = 1; i <= n; i ++) {
		dp[i] = 1;
		int prefix = a[i] >> 10;
		int suffix = a[i] - (prefix << 10);
		for (int mask = 0; mask < M; mask++) {
			int left = b[i] - cnt[mask & prefix];
			if (left < 0 || left > 10) continue;
			int y = g[mask][suffix][left];
			if (dp[y] + 1 > dp[i]) {
				dp[i] = dp[y] + 1; par[i] = y;
			}
		}
		if (dp[i] > ans.fi)
			ans = mp(dp[i], i);
		for (int mask = 0; mask < M; mask ++) {
			int x = mask & suffix; int &y = g[prefix][mask][cnt[x]];
			if (dp[y] < dp[i])
				y = i;
		}
	}
	while (ans.fi > 0) {
		order.push_back(ans.se);
		ans.se = par[ans.se]; ans.fi--;
	}
	reverse(order.begin(), order.end());
	printf("%lu\n", order.size());
	for (int i = 0; i < order.size(); i++) printf("%d ", order[i]);
}

Compilation message (stderr)

subsequence.cpp: In function 'int main()':
subsequence.cpp:62:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < order.size(); i++) printf("%d ", order[i]);
                    ^
subsequence.cpp:30:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
subsequence.cpp:31:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for (int i = 1; i <= n; i++) scanf("%d", &a[i]);
                                                 ^
subsequence.cpp:32:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for (int i = 1; i <= n; i++) scanf("%d", &b[i]);
                                                 ^

• Subtask 1: 7 / 7
• Subtask 2: 16 / 16
• Subtask 3: 17 / 17
• Subtask 4: 60 / 60