CSES - HIIT Open 2018 - Results
Submission details
Task:Buy Low, Sell High
Sender:Ukkonen Fan Club
Submission time:2018-05-26 11:27:25
Language:C++
Status:READY
Result:ACCEPTED
Test results
testverdicttime
#1ACCEPTED0.11 sdetails
#2ACCEPTED0.26 sdetails
#3ACCEPTED0.21 sdetails
#4ACCEPTED0.24 sdetails
#5ACCEPTED0.22 sdetails
#6ACCEPTED0.01 sdetails
#7ACCEPTED0.02 sdetails
#8ACCEPTED0.01 sdetails
#9ACCEPTED0.11 sdetails

Code

#include <iostream>

const int N = 5 * (int)(1e5);
const int inf = 1e9;
int val[N];
int dp[2][N];

int main() {
	int n;
	std::cin >> n;
	for (int i = 0; i < n; ++i) {
		std::cin >> val[i];
	}
	int cma = 0;
	int cmi = inf;
	int ans = 0;
	for (int i = 0; i < n; ++i) {
		cmi = std::min(cmi, val[i]);
		ans = std::max(ans, val[i] - cmi);
		dp[0][i] = ans;
	}
	ans = 0;
	for (int i = n-1; i >= 0; --i) {
		cma = std::max(cma, val[i]);
		ans = std::max(ans, cma - val[i]);
		dp[1][i] = ans;
	}
	ans = 0;
	for (int i = 0; i < n; ++i) {
		ans = std::max(ans, dp[0][i] + dp[1][i]);
	}
	std::cout << ans << '\n';
}

Test details

Test 1

Verdict: ACCEPTED

input
500000
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...

correct output
0

user output
0

Test 2

Verdict: ACCEPTED

input
500000
1 2 3 4 5 6 7 8 9 10 11 12 13 ...

correct output
499999

user output
499999

Test 3

Verdict: ACCEPTED

input
500000
500000 499999 499998 499997 49...

correct output
0

user output
0

Test 4

Verdict: ACCEPTED

input
500000
617752857 533265574 365848360 ...

correct output
1999980408

user output
1999980408

Test 5

Verdict: ACCEPTED

input
500000
209620375 316066031 756114325 ...

correct output
1999992655

user output
1999992655

Test 6

Verdict: ACCEPTED

input
1
1

correct output
0

user output
0

Test 7

Verdict: ACCEPTED

input
2
1 1

correct output
0

user output
0

Test 8

Verdict: ACCEPTED

input
2
2 1

correct output
0

user output
0

Test 9

Verdict: ACCEPTED

input
500000
1 1000000000 2 2 2 2 2 2 2 2 2...

correct output
1999999998

user output
1999999998