Submission #506311

#	Time	Username	Problem	Language	Result	Execution time	Memory
506311		mewnian	Palembang Bridges (APIO15_bridge)	C++14	22 / 100	39 ms	5700 KiB

bridge

//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC target("avx,avx2,fma")

#include <bits/stdc++.h>
#define sze(x) (ll) x.size()
#define idx(x, a) get<x>(a)
#define LID(x) (x << 1LL)
#define RID(x) (x << 1LL) + 1LL
#define ID(x) (x + MAXN)
#define CONV(x) (x - MAXN)
#define countbit(x) __builtin_popcountll(x)
#define pb push_back
#define mp make_pair
#define fi first
#define se second

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> pi;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

ll rand(ll l, ll r)
{
    return uniform_int_distribution<ll>(l, r)(rng);
}

inline ll lcm(ll u, ll v)
{
    return u * v / __gcd(u, v);
}

const ll MAXN = 2e5 + 3;
const ll INF = 1e18;

pi a[MAXN];
ll b[MAXN];
ll k, n, m, res = 0;

ll solve(ll u, ll v)
{
    ll rt = 0;
    for (ll i = 1; i <= n; ++i)
    {
        ll mn = min(abs(a[i].fi - u) + abs(a[i].se - u) + 1, abs(a[i].fi - v) + abs(a[i].se - v) + 1);
        rt += mn;
    }
    return rt;
}

ll comp(ll x, ll y)
{
    return (x > y ? 1 : (x < y ? -1 : 0));
}

void solve1()
{
    ll x = b[m / 2];
    for (ll i = 1; i <= n; ++i)
    {
        ll rt = abs(a[i].fi - x) + abs(a[i].se - x) + 1;
        res += rt;
    }
    cout << res;
}

void solve2()
{
    ll rt = INF;
    for (ll l = 1; l <= m; ++l)
    {
        ll pre = INF;
        for (ll r = l + 1; r <= m; ++r)
        {
            ll tans = solve(l, r);
            if (pre < tans) break;
            pre = min(pre, tans);
        }
        rt = min(rt, pre);
    }
    res += rt;
    cout << res;
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    #ifdef OFFLINE
    freopen("input.inp", "r", stdin);
    #endif
    ll _;
    cin >> k >> _;
    n = 0, m = 0;
    ll mn = INF, mx = -INF;
    set<ll> s;
    for (ll i = 1; i <= _; ++i)
    {
        char c1, c2; ll p1, p2; cin >> c1 >> p1 >> c2 >> p2;
        if (c1 == c2) res += abs(p1 - p2);
        else
        {
            b[++m] = p1, b[++m] = p2;
            a[++n] = {p1, p2};
        }
    }
    sort(b + 1, b + m + 1);
    if (k == 1) solve1();
    else solve2();
}

Compilation message (stderr)

bridge.cpp: In function 'int main()':
bridge.cpp:99:8: warning: unused variable 'mn' [-Wunused-variable]
   99 |     ll mn = INF, mx = -INF;
      |        ^~
bridge.cpp:99:18: warning: unused variable 'mx' [-Wunused-variable]
   99 |     ll mn = INF, mx = -INF;
      |                  ^~

• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 0 / 9
• Subtask 4: 0 / 32
• Subtask 5: 0 / 37