Submission #533912

#	Time	Username	Problem	Language	Result	Execution time	Memory
533912		hollwo_pelw	Split the sequence (APIO14_sequence)	C++17	0 / 100	8 ms	1228 KiB

sequence

/*
// is short or still long ???
hollwo_pelw's template(short)
// Note : -Dhollwo_pelw_local
*/
 
#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/trie_policy.hpp>
// #include <ext/rope>
 
using namespace std;
// using namespace __gnu_pbds;
// using namespace __gnu_cxx;
 
void FAST_IO(string filein = "", string fileout = "", string fileerr = ""){
	if (fopen(filein.c_str(), "r")){
		freopen(filein.c_str(), "r", stdin);
		freopen(fileout.c_str(), "w", stdout);
#ifdef hollwo_pelw_local
		freopen(fileerr.c_str(), "w", stderr);
#endif
	}
	cin.tie(0), cout.tie(0) -> sync_with_stdio(0);
}
 
void Hollwo_Pelw();
 
signed main(){
#ifdef hollwo_pelw_local
	FAST_IO("input.inp", "output.out", "error.err");
	auto start = chrono::steady_clock::now();
#else
	FAST_IO("hollwo_pelw.inp", "hollwo_pelw.out");
#endif
	int testcases = 1;
	// cin >> testcases;
	for (int test = 1; test <= testcases; test++){
		// cout << "Case #" << test << ": ";
		Hollwo_Pelw();
	}
#ifdef hollwo_pelw_local
	auto end = chrono::steady_clock::now();
	cout << "\nExcution time : " << chrono::duration_cast<chrono::milliseconds> (end - start).count() << "[ms]" << endl;
#endif
	return 0;
}
 
const int N = 1e5 + 5, K = 202;
 
int n, k, pre[N], tr[K][N];
 
int64_t dp[2][N];
 
inline bool chkmax(int64_t &a, int64_t b) {
	return a < b ? a = b, 1 : 0;
}
 
int64_t calc(int l, int r) {
	return 1ll * (pre[r] - pre[l]) * (pre[n] - pre[r]);
}
 
void solve(int lvl, int l, int r, int opl, int opr) {
	if (l > r) return ;
	int m = l + r >> 1, opm = 0;
	dp[lvl & 1][m] = -1e18;
	for (int i = opl; i <= min(m - 1, opr); i++)
		if (chkmax(dp[lvl & 1][m], dp[lvl & 1 ^ 1][i] + calc(i, m))) opm = i;
	tr[lvl][m] = opm;
	assert(opm > 0);
	solve(lvl, l, m - 1, opl, opm);
	solve(lvl, m + 1, r, opm, opr);
}
 
void Hollwo_Pelw() {
	cin >> n >> k;
	for (int i = 1; i <= n; i++)
		cin >> pre[i], pre[i] += pre[i - 1];
 
	for (int i = 1; i <= k; i++)
		solve(i, i, n - 1, 0, n - 1);
 
	// for (int i = 1; i < n; i++)
	// 	cout << dp[k & 1][i] << " ";
	int64_t res = -1e18, cur = 0;
	for (int i = k; i < n; i++)
		if (chkmax(res, dp[k & 1][i])) cur = i;
	assert(cur != 0);
	cout << res << '\n';
	for (; k; cur = tr[k --][cur])
		cout << cur << ' ';
}

Compilation message (stderr)

sequence.cpp: In function 'void solve(int, int, int, int, int)':
sequence.cpp:65:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   65 |  int m = l + r >> 1, opm = 0;
      |          ~~^~~
sequence.cpp:68:37: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
   68 |   if (chkmax(dp[lvl & 1][m], dp[lvl & 1 ^ 1][i] + calc(i, m))) opm = i;
      |                                 ~~~~^~~
sequence.cpp: In function 'void FAST_IO(std::string, std::string, std::string)':
sequence.cpp:18:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |   freopen(filein.c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
sequence.cpp:19:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |   freopen(fileout.c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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