Submission #963895

#	Time	Username	Problem	Language	Result	Execution time	Memory
963895		steveonalex	Rail (IOI14_rail)	C++17	100 / 100	126 ms	1432 KiB

rail

#include <bits/stdc++.h>
#include "rail.h"
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define ALL(v) (v).begin(), (v).end()
#define MASK(i) (1LL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
 
// mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rng(1);
ll rngesus(ll l, ll r){return ((ull) rng()) % (r - l + 1) + l;}
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
 
ll LASTBIT(ll mask){return mask & (-mask);}
ll pop_cnt(ll mask){return __builtin_popcountll(mask);}
ll ctz(ll mask){return __builtin_ctzll(mask);}
ll clz(ll mask){return __builtin_clzll(mask);}
ll logOf(ll mask){return 63 - clz(mask);}
 
template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b){a = b; return true;}
        return false;
    }
template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b){a = b; return true;}
        return false;
    }
template <class T>
    void printArr(T& a, string separator = " ", string finish = "\n", ostream& out = cout){
        for(auto i: a) out << i << separator;
        out << finish;
    }
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }
 
// int getDistance(int i, int j){
//     cout << "? " << i << " " << j << endl;
//     int verdict; cin >> verdict;
//     return verdict;
// }
 
void findLocation(int n, int first, int location[], int stype[]){
    for(int i = 0; i<n; ++i) location[i] = stype[i] = 0;
    location[0] = first; stype[0] = 1;
 
    vector<int> from0(n);
    for(int i = 1; i<n; ++i){
        from0[i] = getDistance(0, i);
    }
 
    vector<int> sigma(n);
    for(int i= 0; i<n; ++i) sigma[i] = i;
 
    sort(ALL(sigma), [&from0](int x, int y){return from0[x] < from0[y];});
 
    int l = -1, r = -1;
    stype[0] = 1; stype[sigma[1]] = 2;
    location[0] = first, location[sigma[1]] = first + from0[sigma[1]];
 
    printArr(sigma, " ", "\n", cerr);
 
    map<int, int> mp;
    mp[location[0]] = 0;
    mp[location[sigma[1]]] = sigma[1];
 
    set<int> down; down.insert(location[0]);
    set<int> up; up.insert(location[sigma[1]]);
    for(int i: sigma){
        if (i == 0 || i == sigma[1]) continue;
        cerr << "cur: " << i << "\n";
        int x = getDistance(sigma[1], i);
        if (x + from0[sigma[1]] != from0[i]){ // to the right of 1
            cerr << "right\n";
            if (r == -1){
                location[i] = location[0] + from0[i];
                stype[i] = 2;
                r = i;
            }
            else{
                int y = getDistance(r, i);
                int pos = *up.upper_bound(location[r] - y);
                int z = mp[pos];
                if (from0[z] + y - abs(from0[r] - from0[z]) == from0[i]){
                    location[i] = location[r] - y;
                    stype[i] = 1;
                }
                else{
                    location[i] = location[0] + from0[i];
                    stype[i] = 2;
                    r = i;
                }
            }
        }
        else{ // to the left of 1
            cerr << "left\n";
            if (x < from0[sigma[1]]){
                location[i] = location[sigma[1]] - x;
                stype[i] = 1;
            }
            else if (l == -1){
                location[i] = location[sigma[1]] - x;
                stype[i] = 1;
                l = i;
            }
            else{
                int y = getDistance(l, i);
                int pos = *(--down.upper_bound(location[l] + y));
                int z = mp[pos];
                // cerr << y << " " << pos << " " << location[l] << " " << from0[z] << "\n";
                if (from0[z] + y - abs(from0[l] - from0[z]) == from0[i]){
                    location[i] = location[l] + y;
                    stype[i] = 2;
                }
                else{
                    location[i] = location[0] - from0[i] + from0[sigma[1]] * 2;
                    stype[i] = 1;
                    l = i;
                }
            }
 
        }
        mp[location[i]] = i;
        if (stype[i] == 1) down.insert(location[i]);
        else up.insert(location[i]);
        cerr << stype[i] << " " << location[i] << "\n";
    }
 
}
 
 
// int main(void){
//     ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
 
//     int n = 4;
//     int location[n], stype[n];
//     findLocation(n, 3, location, stype);
//     for(int i = 0; i<n; ++i) cout << location[i] << " " << stype[i] << "\n";
 
//     return 0;
// }

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