Submission #428582

#	Time	Username	Problem	Language	Result	Execution time	Memory
428582		lyc	Park (JOI17_park)	C++14	20 / 100	166 ms	536 KiB

park

#include "park.h"

#include <bits/stdc++.h>
using namespace std;

#define TRACE(x) cerr << #x << " :: " << x << endl
#define _ << " " <<
#define SZ(x) ((int)(x).size())
#define ALL(x) (x).begin(),(x).end()
#define FOR(i,a,b) for(int i=(a);i<=(b);++i)
#define RFOR(i,a,b) for(int i=(a);i>=(b);--i)

static int Place[1400];

void myans(int i, int j) {
    if (i > j) swap(i,j);
    Answer(i,j);
}

bool myask(int i, int j, vector<int> v) {
    if (i > j) swap(i,j);
    v.push_back(i);
    v.push_back(j);

    for (int& x : v) Place[x] = 1;
    int ret = Ask(i,j,Place);
    for (int& x : v) Place[x] = 0;
    return ret;
}

vector<int> ans;
void solve(vector<int> v) {
    int l = 0;
    while (true) {
        int it = SZ(ans);
        FOR(i,0,SZ(ans)-1) if (ans[i] == l) { it = i+1; break; }
        if (it >= SZ(ans)) break;
        int u = ans[it];
        while (true) {
            //TRACE("CHECK" _ l _ u);
            if (myask(l,u,{})) {
                //TRACE("ANSWER" _ l _ u);
                myans(l,u);
                l = u;
                break;
            }

            int lo = -1, hi = SZ(v);
            while (hi-lo > 1) {
                int mid = (lo+hi)/2;

                vector<int> v2;
                FOR(i,0,mid) v2.push_back(v[i]);
                if (myask(l,u,v2)) hi = mid;
                else lo = mid;
            }
            u = v[hi];

            v.erase(find(ALL(v),u));
            FOR(i,0,SZ(ans)-1) if (ans[i] == l) {
                ans.insert(ans.begin()+i+1, u);
                break;
            }
        }
    }
    //for (int& x : v) { cout << x << ' '; } cout << endl;
    //for (int& x : ans) { cout << x << ' '; } cout << endl;
}

void Detect(int T, int N) {
    if (T == 1) {
        FOR(i,0,N-1){
            FOR(j,i+1,N-1){
                Place[i] = Place[j] = 1;
                if (Ask(i,j,Place)) Answer(i,j);
                Place[i] = Place[j] = 0;
            }
        }
    } else if (T == 2) {
        ans.push_back(0);
        ans.push_back(N-1);

        vector<int> v;
        FOR(i,1,N-2) v.push_back(i);
        solve(v);
    }
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 27
• Subtask 4: 0 / 30
• Subtask 5: 0 / 23