Submission #996827

#	Time	Username	Problem	Language	Result	Execution time	Memory
996827		dreamboy	Palembang Bridges (APIO15_bridge)	C++17	31 / 100	2078 ms	13456 KiB

bridge

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
//using namespace __gnu_pbds;

#define speed ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define russian setlocale(LC_ALL,"Russian_Russia.20866");
#define file freopen("onlyone.in", "r", stdin), freopen("onlyone.out", "w", stdout);
#define ll long long
#define ull unsigned long long
#define ld long double
#define pll pair<ll, ll>
#define pii pair<int, int>
#define all(s) s.begin(), s.end()
#define pb push_back
#define ins insert
#define mp make_pair
#define sz(x) x.size()
#define F first
#define S second
#define lb lower_bound
#define ub upper_bound
#define mem(x) memset(x, 0, sizeof(x))
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const ll N = 30010;
const ll M = 600000;
const ll block = 316;
const ll mod = 998244353;
const ll P = 263;
const ld pi = acos(-1);
const ll inf = 1e9;

ll add(ll a, ll b) {
    if(a + b < 0) return a + b + mod;
    if(a + b >= mod) return a + b - mod;
    return a + b;
}

ll sub(ll a, ll b) {
    return (a - b + mod) % mod;
}

ll mul(ll a, ll b) {
    return a * 1LL * b % mod;
}

ll binpow(ll a, ll n) {
    ll res = 1LL;
    while(n) {
        if(n & 1) res = mul(res, a); // if(n % 2 == 1)
        a = mul(a, a);
        n >>= 1; //n / 2
    }
    return res;
}

ll inv(ll x) {//число х в степени -1
    return binpow(x, mod - 2);
}
ll k, n;
vector<pll> v;
ll f(ll x) {
    ll prod = 0LL;
    for(auto to: v) {
        prod += (abs(x - to.F) + abs(x - to.S) + 1LL);
    }
    return prod;
}
void solve() {
    cin >> k >> n;
    ll delt = 0LL;
    set<ll> s;
    for(ll i = 1; i <= n; i++) {
        char a, b;
        ll x, y;
        cin >> a >> x >> b >> y;
        s.insert(x); s.insert(y);
        if(a == b) delt += abs(x - y);
        else v.pb({x, y});
    }
    if(k == 1) {
        ll l = 0LL, r = 1e9 + 10LL;
        while(r - l > 1000) {
            ll m1 = l + (r - l) / 3;
            ll m2 = r - (r - l) / 3;
            if(f(m1) < f(m2)) r = m2;
            else l = m1;
        }
        ll ans = LLONG_MAX;
        for(ll i = l; i <= r; i++) {
            ans = min(ans, f(i));
        }
        cout << ans + delt << '\n';
    }
    else {
        ll ans = LLONG_MAX;
        for(auto k1: s) {
            for(auto k2: s) {
                if(k1 == k2) continue;
                ll cur = 0LL;
                for(auto [x, y]: v) {
                    cur += min((abs(k1 - x) + abs(k1 - y) + 1LL), (abs(k2 - x) + abs(k2 - y) + 1LL));
                }
                ans = min(ans, cur);
            }
        }
        cout << ans + delt << '\n';
    }
}
signed main() {
    speed;
    //file;
    int test = 1;
    //cin >> test;
    while(test--) {
        solve();
    }
}

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