Submission #863008

#	Time	Username	Problem	Language	Result	Execution time	Memory
863008		LePhiPhat	Bigger segments (IZhO19_segments)	C++17	27 / 100	1555 ms	70952 KiB

segments

// https://codeforces.com/blog/entry/64479?#comment-484350
#include <iostream>
#include <cstdint>
#include <string>
#include <vector>

using namespace std;

#ifdef DEBUG 
#include "debuge.cpp"
#else
#define debug(...) 42
#endif

typedef            long long ll;
typedef       pair<int, int>  pii;
typedef         pair<ll, ll>  pll;
typedef pair<double, double> pdd;
typedef          vector<int>  vi;
typedef           vector<ll>  vll;
typedef          vector<pii>  vii;

#define                   fi  first
#define                   se  second
#define               all(v)  (v).begin(), (v).end()
#define                SZ(x)  ((int) (x).size())
#define                   pb  push_back
#define                   pf  push_front
#define                   lb  lower_bound
#define                   ub  upper_bound
 
#define         FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define         ROF(i, a, b) for (int i = (a); i > (b); --i)


void LPP(int &test)  {
	int n;
	cin >> n;
	vll a(n + 1), p(n + 1);
	vector<vll> dp(n + 1, vll(n + 1, -1));
	for (int i = 1; i <= n; i++) cin >> a[i];
	for (int i = 1; i <= n; i++) p[i] = p[i - 1] + a[i];
	dp[0][0] = 0;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= i; j++) {
			for (int k = i; k >= 1; k--) if (dp[k - 1][j - 1] != -1) {
				int r = k - 1, l = dp[k - 1][j - 1];
				ll lst = p[r] - p[l];
				ll now = p[i] - p[r];
				if (now >= lst) {
					dp[i][j] = max(dp[i][j], (k - 1) * 1ll);; 
				}
				debug(i, j, r, l, now, lst, dp[i][j]);
			}
		}
	}
	int ans = 1;
	FOR(j, 0, n + 1) {
		if (dp[n][j] != -1) ans = max(ans, j);
	}
	cout << ans;
}

int32_t main() {
	cin.tie(0) -> ios::sync_with_stdio(false);
	int tc = 1;
	// cin >> tc;
	for (int i = 1; i <= tc; i++) LPP(i);
}






































/*
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ordered_set tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>
*/

Compilation message (stderr)

segments.cpp: In function 'void LPP(int&)':
segments.cpp:12:20: warning: statement has no effect [-Wunused-value]
   12 | #define debug(...) 42
      |                    ^~
segments.cpp:53:5: note: in expansion of macro 'debug'
   53 |     debug(i, j, r, l, now, lst, dp[i][j]);
      |     ^~~~~

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27