Submission #236749

#	Time	Username	Problem	Language	Result	Execution time	Memory
236749		Vimmer	Krov (COCI17_krov)	C++14	56 / 140	1593 ms	768 KiB

krov

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")

#define F first
#define S second
#define sz(x) int(x.size())
#define pb push_back
#define N 100001
#define M ll(1e9 + 7)
#define inf 1e9 + 1e9

using namespace std;
//using namespace __gnu_pbds;

typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef short int si;
typedef array <int, 2> a2;

//typedef tree <int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

int n, a[N];

ll calc(ll x, int pos)
{
    if (x - pos <= 0) return 1e18;

    ll sum = 0;

    for (int i = 0; i < pos; i++) sum += abs(a[i] - (x - abs(pos - i)));

    for (int i = pos + 1; i < n; i++) sum += abs(a[i] - (x - abs(pos - i)));

    return sum + abs(x - a[pos]);
}

int main()
{
    //freopen("input.txt", "r", stdin); //freopen("output4.txt", "w", stdout);

    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    cin >> n;

    for (int i = 0; i < n; i++) cin >> a[i];

    ll ans = 1e18, pos;


    for (int i = 0; i <= 0; i++)
    {
        int l = 0, r = 1e9;

        while (l + 10 < r)
        {
            int mdl = l + (r - l) / 3;

            int mdr = r - (r - l) / 3;

            if (calc(mdl, i) > calc(mdr, i)) l = mdl; else r = mdr;
        }

        for (int x = l; x <= r; x++)
        {
            ll val = calc(x, i);

            if (ans > val) {ans = val; pos = x;}
        }
    }

    for (int i = 1; i < n; i++)
    {
        for (int x = pos - 1; x <= pos + 1; x++)
        {
            ll val = calc(x, i);

            if (ans > val) {ans = val; pos = x;}
        }
    }

    cout << ans;
}

Compilation message (stderr)

krov.cpp: In function 'int main()':
krov.cpp:81:40: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
         for (int x = pos - 1; x <= pos + 1; x++)
                                    ~~~~^~~

• Subtask 1: 14 / 14
• Subtask 2: 0 / 14
• Subtask 3: 0 / 14
• Subtask 4: 14 / 14
• Subtask 5: 14 / 14
• Subtask 6: 14 / 14
• Subtask 7: 0 / 14
• Subtask 8: 0 / 14
• Subtask 9: 0 / 14
• Subtask 10: 0 / 14