Submission #99543

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
99543	2019-03-05T00:45:27 Z	jhnah917	전봇대 (KOI13_pole)	C++14	100 / 100	41 ms	2200 KB

pole

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

int n;
vector<ll> v;

ll f(ll x){
	ll ret = 0;
	for(ll i=0; i<n; i++){
		ret += abs(v[i] - (i*x));
	}
	return ret;
}

int main(){
	ios_base::sync_with_stdio(0); cin.tie(0);
	cin >> n; v.resize(n);
	for(int i=0; i<n; i++) cin >> v[i];
	ll s = 0, e = 1e9;
	while(s+3 <= e){
		ll t1 = (s+s+e)/3;
		ll t2 = (s+e+e)/3;
		if(f(t1) > f(t2)) s = t1;
		else e = t2;
	}
	ll ans = s, mini = f(s);
	for(int i=s; i<=e; i++){
		ll now = f(i);
		if(now < mini){
			ans = i; mini = now;
		}
	}
	cout << mini;
}

Compilation message

pole.cpp: In function 'int main()':
pole.cpp:28:5: warning: variable 'ans' set but not used [-Wunused-but-set-variable]
  ll ans = s, mini = f(s);
     ^~~

Subtask #1

11.0 / 11.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	512 KB	Output is correct
2	Correct	0 ms	384 KB	Output is correct
3	Correct	2 ms	384 KB	Output is correct
4	Correct	2 ms	384 KB	Output is correct
5	Correct	3 ms	384 KB	Output is correct
6	Correct	2 ms	384 KB	Output is correct
7	Correct	3 ms	256 KB	Output is correct
8	Correct	2 ms	384 KB	Output is correct
9	Correct	2 ms	384 KB	Output is correct
10	Correct	2 ms	384 KB	Output is correct

Subtask #2

21.0 / 21.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	3 ms	384 KB	Output is correct
2	Correct	2 ms	384 KB	Output is correct
3	Correct	3 ms	412 KB	Output is correct
4	Correct	2 ms	384 KB	Output is correct
5	Correct	2 ms	384 KB	Output is correct
6	Correct	2 ms	384 KB	Output is correct
7	Correct	2 ms	384 KB	Output is correct
8	Correct	3 ms	384 KB	Output is correct

Subtask #3

31.0 / 31.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	512 KB	Output is correct
2	Correct	3 ms	384 KB	Output is correct
3	Correct	5 ms	512 KB	Output is correct
4	Correct	6 ms	512 KB	Output is correct
5	Correct	7 ms	512 KB	Output is correct
6	Correct	6 ms	512 KB	Output is correct

Subtask #4

37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	41 ms	2080 KB	Output is correct
2	Correct	27 ms	2200 KB	Output is correct
3	Correct	29 ms	2176 KB	Output is correct
4	Correct	41 ms	2048 KB	Output is correct
5	Correct	26 ms	2176 KB	Output is correct
6	Correct	29 ms	2048 KB	Output is correct