Submission #35141

#	Time	Username	Problem	Language	Result	Execution time	Memory
35141		UncleGrandpa925	Split the sequence (APIO14_sequence)	C++14	50 / 100	2000 ms	84440 KiB

sequence

/*input
5 4
1 2 3 4 5
*/
#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, m;
int a[N];
int sum[N];
long long dp[N][2];
int par[N][205];
vector<int> order;
signed main() {
#ifdef UncleGrandpa
	freopen("1test.inp", "r", stdin);
#endif
	scanf("%d %d", &n, &m);
	for (int i = 1; i <= n; i++) scanf("%d", &a[i]), sum[i] = sum[i - 1] + a[i];
	for (int i = 1; i <= n; i++) dp[i][0] = 0;
	for (int p = 1; p <= m; p++) {
		int c = p & 1;
		for (int i = 0; i < N; i++) dp[i][c] = 0;
		for (int i = 2; i <= n; i++) {
			for (int j = 1; j < i; j++) {
				if (dp[j][c ^ 1] + sum[j] * 1LL * (sum[i] - sum[j]) >= dp[i][c]) {
					dp[i][c] = dp[j][c ^ 1] + sum[j] * 1LL * (sum[i] - sum[j]);
					par[i][p] = j;
				}
			}
		}
	}
	printf("%lld\n", dp[n][m & 1]);
	pair<int, int> cur = mp(n, m);
	while (cur.se >= 1) {
		order.push_back(par[cur.fi][cur.se]);
		cur.fi = par[cur.fi][cur.se]; cur.se--;
	}
	reverse(order.begin(), order.end());
	// for (int i = 0; i < order.size(); i++) assert(order[i] != 0);
	for (int i = 0; i < order.size(); i++) printf("%d ", order[i]);
}

Compilation message (stderr)

sequence.cpp: In function 'std::ostream& operator<<(std::ostream&, std::vector<int>&)':
sequence.cpp:16:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < x.size(); i++) os << x[i] << sp;
                    ^
sequence.cpp: In function 'std::ostream& operator<<(std::ostream&, std::vector<std::pair<int, int> >&)':
sequence.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < x.size(); i++) os << x[i] << endl;
                    ^
sequence.cpp: In function 'int main()':
sequence.cpp:61:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < order.size(); i++) printf("%d ", order[i]);
                    ^
sequence.cpp:38:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
                        ^
sequence.cpp:39:77: 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]), sum[i] = sum[i - 1] + a[i];
                                                                             ^

• Subtask 1: 11 / 11
• Subtask 2: 11 / 11
• Subtask 3: 11 / 11
• Subtask 4: 17 / 17
• Subtask 5: 0 / 21
• Subtask 6: 0 / 29