Submission #996061

#	Time	Username	Problem	Language	Result	Execution time	Memory
996061		khanhtb	Xylophone (JOI18_xylophone)	C++17	0 / 100	1 ms	2644 KiB

xylophone

#include<bits/stdc++.h>
#include "xylophone.h"
#define ll long long
#define ull unsigned long long
#define ld long double
#define pb push_back
#define pf push_front
#define vi vector<ll>
#define vii vector<vi>
#define pll pair<ll,ll>
#define vpll vector<pll>
#define all(a) a.begin(), a.end()
#define fi first
#define se second
using namespace std;
const ll mod = 1e9+7;
const ll inf = 1e18;
const ll base = 31;
const ll blocksz = 320;
const ll N = 2e5+8;
const ll buff = 1e5+1;
ll a[N],dist[N][2];
bool check(int n){
    set<ll> s;
    bool meetn = 0;
    for(ll i = 1; i <= n; i++){
        cout << a[i] << ' ';
        s.insert(a[i]);
        if(a[i] == 1 && meetn) return 0;
        if(a[i] == n) meetn = 1;
    }
    cout << '\n';
    if(s.size() != n) return 0;
    if(*s.begin() != 1) return 0;
    if(*s.rbegin() != n) return 0;
    return 1;
}
void solve(int n){
    for(ll i = 2; i <= n; i++){
        if(i > 1) dist[i][0] = query(i-1,i);
        if(i > 2) dist[i][1] = query(i-2,i);
    }
    for(ll x = 1; x <= n; x++){
        a[1] = x;
        a[2] = x+dist[2][0];
        for(ll i = 3; i <= n; i++){
            if(a[i-2] > a[i-1]){
                if (a[i-2]-a[i-1]+dist[i][0] == dist[i][1]) a[i] = a[i-1]-dist[i][0];
                else a[i] = a[i-1]+dist[i][0];
            }
            else{
                if (a[i-2]-a[i-1]+dist[i][0] == dist[i][1]) a[i] = a[i-1]+dist[i][0];
                else a[i] = a[i-1]-dist[i][0];
            }
        }
        if(check(n)) break;
        a[1] = x;
        a[2] = x-dist[2][0];
        for(ll i = 3; i <= n; i++){
            if(a[i-2] > a[i-1]){
                if (a[i-2]-a[i-1]+dist[i][0] == dist[i][1]) a[i] = a[i-1]-dist[i][0];
                else a[i] = a[i-1]+dist[i][0];
            }
            else{
                if (a[i-2]-a[i-1]+dist[i][0] == dist[i][1]) a[i] = a[i-1]+dist[i][0];
                else a[i] = a[i-1]-dist[i][0];
            }
        }
        if(check(n)) break;
    }
    for(ll i = 1; i <= n; i++) answer(i,a[i]);
}

Compilation message (stderr)

xylophone.cpp: In function 'bool check(int)':
xylophone.cpp:33:17: warning: comparison of integer expressions of different signedness: 'std::set<long long int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   33 |     if(s.size() != n) return 0;
      |        ~~~~~~~~~^~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 36
• Subtask 3: 0 / 53