Submission #436636

#	Time	Username	Problem	Language	Result	Execution time	Memory
436636		Tangent	Rail (IOI14_rail)	C++17	30 / 100	101 ms	1476 KiB

rail

#include "rail.h"
#include "bits/stdc++.h"
 
using namespace std;
 
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vii;
typedef vector<ll> vll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
typedef vector<vii> vvii;
typedef vector<vll> vvll;
typedef vector<vpii> vvpii;
typedef vector<vpll> vvpll;
 
#define ffor(i, a, b) for (ll i = (a); i < (ll)(b); i++)
#define fford(i, a, b) for (ll i = (a); i > (ll)(b); i--)
#define rep(i, n) ffor(i, 0, n)
#define forin(x, a) for (auto &x: a)
#define all(a) a.begin(), a.end()

map<pii, int> memo;
int dist(int i, int j) {
    if (i > j) {
        swap(i, j);
    }
    if (!memo[{i, j}]) {
        memo[{i, j}] = getDistance(i, j);
    }
    return memo[{i, j}];
}

void findLocation(int N, int first, int location[], int stype[]) {
    location[0] = first;
    stype[0] = 1;
    int closest = 1, mindist = dist(0, 1);
    ffor(i, 2, N) {
        if (dist(0, i) < mindist) {
            mindist = dist(0, i);
            closest = i;
        }
    }

    location[closest] = first + dist(0, closest);
    stype[closest] = 2;

    vpii left, right;
    ffor(i, 1, N) {
        if (i != closest) {
            if (dist(0, i) == dist(0, closest) + dist(closest, i)) {
                left.emplace_back(dist(closest, i), i);
            } else {
                right.emplace_back(dist(0, i), i);
            }
        }
    }

    sort(all(left));
    sort(all(right));

    int front = 0, back = closest;
    forin(p, right) {
        int i = p.second;
        if (first + dist(0, i) + location[back] - 2 * location[front] == dist(back, i)) {
            location[i] = first + dist(0, i);
            stype[i] = 2;
            back = i;
        } else {
            location[i] = location[back] - dist(back, i);
            stype[i] = 1;
            front = i;
        }
    }

    front = closest, back = 0;
    forin(p, left) {
        int i = p.second;
        if (-location[closest] + dist(closest, i) - location[back] + 2 * location[front] == dist(back, i)) {
            location[i] = location[closest] - dist(closest, i);
            stype[i] = 1;
            back = i;
        } else {
            location[i] = location[back] + dist(back, i);
            stype[i] = 2;
            front = i;
        }
    }
}

• Subtask 1: 8 / 8
• Subtask 2: 22 / 22
• Subtask 3: 0 / 26
• Subtask 4: 0 / 44