Submission #99543

#	Time	Username	Problem	Language	Result	Execution time	Memory
99543		jhnah917	전봇대 (KOI13_pole)	C++14	100 / 100	41 ms	2200 KiB

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 (stderr)

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 / 11
• Subtask 2: 21 / 21
• Subtask 3: 31 / 31
• Subtask 4: 37 / 37