Submission #36172

#	Time	Username	Problem	Language	Result	Execution time	Memory
36172		UncleGrandpa925	Longest beautiful sequence (IZhO17_subsequence)	C++14	0 / 100	0 ms	94080 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 bit(x,y) ((x>>y)&1LL)
#define na(x) (#x) << ":" << x
ostream& operator << (ostream &os, vector<int>&x) {
	for (int i = 0; i < x.size(); i++) os << x[i] << sp;
	return os;
}
ostream& operator << (ostream &os, pair<int, int> x) {
	cout << x.fi << sp << x.se << sp;
	return os;
}
ostream& operator << (ostream &os, vector<pair<int, int> >&x) {
	for (int i = 0; i < x.size(); i++) os << x[i] << endl;
	return os;
}

int n;
int a[N], b[N];
int cnt[N];
int dp[N], par[N];
int best[(1 << 10)][(1 << 10)][11];
int pbest[(1 << 10)][(1 << 10)][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 < (1 << 20); i++) cnt[i] = __builtin_popcount(i);
	memset(best, 0, sizeof(best)); memset(pbest, 0, sizeof(pbest));
	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 < (1 << 10); mask ++) {
			int curmask = mask & prefix;
			if (cnt[curmask] > b[i] || b[i] - cnt[curmask] > 10) continue;
			if (best[prefix][suffix][b[i] - cnt[curmask]] + 1 > dp[i]) {
				if (i == 4 && pbest[prefix][suffix][b[i]] == 2) {
					cout << "X";
				}
				dp[i] = best[prefix][suffix][b[i] - cnt[curmask]] + 1;
				par[i] = pbest[prefix][suffix][b[i]];
			}
		}
		if (dp[i] > ans.fi)
			ans = mp(dp[i], i);
		for (int mask = 0; mask < (1 << 10); mask ++) {
			if (best[prefix][mask][cnt[mask & suffix]] < dp[i]) {
				best[prefix][mask][cnt[mask & suffix]] = dp[i];
				pbest[prefix][mask][cnt[mask & suffix]] = i;
			}
		}
	}
	while (ans.fi > 0) {
		order.push_back(ans.se);
		ans.se = par[ans.se]; ans.fi--;
	}
	reverse(order.begin(), order.end());
	printf("%d\n", order.size());
	for (int i = 0; i < order.size(); i++) printf("%d ", order[i]);
}

Compilation message (stderr)

subsequence.cpp: In function 'std::ostream& operator<<(std::ostream&, std::vector<int>&)':
subsequence.cpp:21:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < x.size(); i++) os << x[i] << sp;
                    ^
subsequence.cpp: In function 'std::ostream& operator<<(std::ostream&, std::vector<std::pair<int, int> >&)':
subsequence.cpp:29:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < x.size(); i++) os << x[i] << endl;
                    ^
subsequence.cpp: In function 'int main()':
subsequence.cpp:79:29: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
  printf("%d\n", order.size());
                             ^
subsequence.cpp:80:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < order.size(); i++) printf("%d ", order[i]);
                    ^
subsequence.cpp:44:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
subsequence.cpp:45:49: 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:46:49: 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]);
                                                 ^
subsequence.cpp:47:68: warning: iteration 100005u invokes undefined behavior [-Waggressive-loop-optimizations]
  for (int i = 0; i < (1 << 20); i++) cnt[i] = __builtin_popcount(i);
                                                                    ^
subsequence.cpp:47:20: note: containing loop
  for (int i = 0; i < (1 << 20); i++) cnt[i] = __builtin_popcount(i);
                    ^

• Subtask 1: 0 / 7
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 60