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Submission #1017626

# Submission time Handle Problem Language Result Execution time Memory
1017626 2024-07-09T09:13:24 Z vjudge1 Feast (NOI19_feast) C++17
12 / 100
 85 ms 12176 KB 
#include<bits/stdc++.h>
using namespace std;
#ifdef ONPC
#include"debug.h"
#else
#define debug(...) 42
#endif
#define endl '\n'
#define ll long long
#define pii pair<int,int>
#define F first
#define S second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
#define int long long
template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
const int mod = 1e9 + 7;
const int MAXN = 3e5 + 15;
const int inf = 0x3f3f3f3f;
const ll INF = 0x3f3f3f3f3f3f3f3f;
int a[MAXN], n, k;
int dp[4 * MAXN]; // i * 0 + 0, i * 0 + 1, i * 0 * 2, i * 0 + 3

//char buf[1 << 25 | 1], *p1, *p2;
//#define gc() ((p1==p2)?(p2=(p1=buf)+fread(buf,1,1<<25,stdin),p1==p2?EOF:*p1++):*p1++)
#define gc() getchar()
ll R(){
	int x = 0, f = 0;
	char c = gc();
	while (!isdigit(c)){
		if (c == '-') f = 1;
		c = gc();
	}
	while (isdigit(c)){
		x = x * 10 + (c ^ 48);
		c = gc();
	}
	return f ? -x : x;
}

void solve(ll lampda){
	dp[0 * 4 + 0] = 0;
	dp[0 * 4 + 1] = 0;
	dp[0 * 4 + 2] = -lampda;
	dp[0 * 4 + 3] = 1;
	for (int i = 1; i <= n; i++){
		dp[i * 4 + 0] = max(dp[(i - 1) * 4 + 0], dp[(i - 1) * 4 + 2]);
		dp[i * 4 + 1] = (dp[(i - 1) * 4 + 0] > dp[(i - 1) * 4 + 2] ? dp[(i - 1) * 4 + 1] : dp[(i - 1) * 4 + 3]);
		dp[i * 4 + 2] = max(dp[(i - 1) * 4 + 0] + a[i] - lampda, dp[(i - 1) * 4 + 2] + a[i]);
		dp[i * 4 + 3] = (dp[(i - 1) * 4 + 0] + a[i] - lampda > dp[(i - 1) * 4 + 2] + a[i] ? dp[(i - 1) * 4 + 1] : dp[(i - 1) * 4 + 3]);

		//dp[i][0] = max(dp[i - 1][0], dp[i - 1][1]);
		//dp[i][1] = max(make_pair(dp[i - 1][0].F + a[i] - lampda, dp[i - 1][0].S + 1), 
				//make_pair(dp[i - 1][1].F + a[i], dp[i - 1][1].S));
	}
	return;
}

int32_t main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	n = R(), k = R();
	//cin >> n >> k;
	for (int i = 1; i <= n; i++){
		a[i] = R();
		//cin >> a[i];
	}
	ll lo = 0, hi = 1e18;
	while (hi - lo > 1){
		ll mi = (lo + hi) >> 1;
		solve(mi);
		if ((dp[n * 4 + 0] > dp[n * 4 + 2] ? dp[n * 4 + 1] : dp[n * 4 + 3]) >= k){
			lo = mi;
		} else {
			hi = mi;
		}
	}
	solve(lo);
	cout << max(dp[n * 4 + 0], dp[n * 4 + 2]) + k * lo;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 39 ms 12124 KB Output is correct
2 Correct 44 ms 12120 KB Output is correct
3 Correct 40 ms 12124 KB Output is correct
4 Correct 44 ms 12120 KB Output is correct
5 Correct 39 ms 12120 KB Output is correct
6 Correct 40 ms 12120 KB Output is correct
7 Correct 42 ms 12132 KB Output is correct
8 Correct 40 ms 12124 KB Output is correct
9 Correct 39 ms 12124 KB Output is correct
10 Correct 40 ms 12120 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 35 ms 12120 KB Output is correct
2 Correct 37 ms 12124 KB Output is correct
3 Correct 35 ms 12140 KB Output is correct
4 Correct 36 ms 12124 KB Output is correct
5 Correct 40 ms 12124 KB Output is correct
6 Correct 35 ms 12124 KB Output is correct
7 Correct 36 ms 12176 KB Output is correct
8 Correct 41 ms 12120 KB Output is correct
9 Correct 39 ms 12124 KB Output is correct
10 Correct 35 ms 12124 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 85 ms 12124 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 39 ms 12124 KB Output is correct
2 Correct 44 ms 12120 KB Output is correct
3 Correct 40 ms 12124 KB Output is correct
4 Correct 44 ms 12120 KB Output is correct
5 Correct 39 ms 12120 KB Output is correct
6 Correct 40 ms 12120 KB Output is correct
7 Correct 42 ms 12132 KB Output is correct
8 Correct 40 ms 12124 KB Output is correct
9 Correct 39 ms 12124 KB Output is correct
10 Correct 40 ms 12120 KB Output is correct
11 Correct 35 ms 12120 KB Output is correct
12 Correct 37 ms 12124 KB Output is correct
13 Correct 35 ms 12140 KB Output is correct
14 Correct 36 ms 12124 KB Output is correct
15 Correct 40 ms 12124 KB Output is correct
16 Correct 35 ms 12124 KB Output is correct
17 Correct 36 ms 12176 KB Output is correct
18 Correct 41 ms 12120 KB Output is correct
19 Correct 39 ms 12124 KB Output is correct
20 Correct 35 ms 12124 KB Output is correct
21 Incorrect 85 ms 12124 KB Output isn't correct
22 Halted 0 ms 0 KB -