Submission #218202

#	Time	Username	Problem	Language	Result	Execution time	Memory
218202		toxic_hack	Swap (BOI16_swap)	C++14	100 / 100	854 ms	2556 KiB

swap

// g++ -std=c++14

/*

Today might be the chance to grasp the chance to let your talent bloom.
May be tomorrow, the day after, or next year...
May be even when you are 30. I'm not sure if physique has anything to do with it
but if you think that it will never come, it probably never will.

- Tooru Oikawa.

*/


#include<bits/stdc++.h>

typedef long long ll;
typedef long double lld;
using namespace std;

#define endl "\n"
#define fi first
#define se second
#define MEMS(a,b) memset(a,b,sizeof(a))
#define _ ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define __ freopen("input.txt","r",stdin);freopen("output.txt","w",stdout);
#define all(c) c.begin(),c.end()
#define pii pair<int, int>

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l, int r)
{
	uniform_int_distribution<int> uid(l, r);
	return uid(rng);
}

#define tr(...) cout<<__FUNCTION__<<' '<<__LINE__<<" = ";trace(#__VA_ARGS__, __VA_ARGS__)
template<typename S, typename T>
ostream& operator<<(ostream& out,pair<S,T> const& p){out<<'('<<p.fi<<", "<<p.se<<')';return out;}

template<typename T>
ostream& operator<<(ostream& out,vector<T> const& v){
ll l=v.size();for(ll i=0;i<l-1;i++)out<<v[i]<<' ';if(l>0)out<<v[l-1];return out;}

template <typename T>
ostream &operator<<(ostream &out, set<T> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << (*i) << ' ';
    return out;
}
template <typename T>
ostream &operator<<(ostream &out, multiset<T> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << (*i) << ' ';
    return out;
}
template <typename T, typename V>
ostream &operator<<(ostream &out, map<T, V> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << "\n" << (i->first) <<  ":"  << (i->second);
    return out;
}

template<typename T>
void trace(const char* name, T&& arg1){cout<<name<<" : "<<arg1<<endl;}

template<typename T, typename... Args>
void trace(const char* names, T&& arg1, Args&&... args){
const char* comma = strchr(names + 1, ',');cout.write(names, comma-names)<<" : "<<arg1<<" | ";trace(comma+1,args...);}

// #define int ll

const int N = 2e5 + 10;
const int inf = 1e9 + 1;
int n, arr[N];

map<pii, int> dp;

int f(int ind, int val) {
    if (dp.count({ind, val})) return dp[{ind, val}];
    // int &ans = dp[{ind, val}];
    int ans = 0;
    if (2 * ind > n) {
        return ans = ind;
    }
    if ((2 * ind + 1) > n) {
        if (arr[2 * ind] > val) return ans = ind;
        return ans = (2 * ind);
    }
    // case 1:
    if (val < arr[2 * ind] && val < arr[2 * ind + 1]) {
        return ans = ind;
    }
    // case 2:
    else if (arr[2 * ind] < min(val, arr[2 * ind + 1])) {
        return ans = f(2 * ind, val);
    }
    // case 3:
    else {
        int a = min(val, arr[2 * ind]);
        int b = max(val, arr[2 * ind]);
        int c = arr[2 * ind + 1];
        int t1 = f(2 * ind, a), t2 = f(2 * ind + 1, a);
        if (t1 < t2) {
            if (a == val) return ans = t1;
            return ans = f(2 * ind + 1, val);
        } else {
            if (a == val) return ans = t2;
            return ans = f(2 * ind, val);
        }
    }
}

int solve() {
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> arr[i];
    }
    arr[n + 1] = inf;
    for (int i = 1; i <= n; i++) {
        if (i * 2 <= n) {
            // case 1:
            if (arr[i] < arr[2 * i] && arr[i] < arr[2 * i + 1]) continue;
            // case 2: 
            else if (arr[2 * i] < min(arr[i], arr[2 * i + 1])) {
                swap(arr[i], arr[2 * i]);
            }  
            // case 3:
            else {
                int a = min(arr[i], arr[2 * i]);
                int b = max(arr[i], arr[2 * i]);
                int c = arr[2 * i + 1];
                arr[i] = c;
                int t1 = f(2 * i, a), t2 = f(2 * i + 1, a);
                if (t1 < t2) {
                    arr[2 * i] = a;
                    arr[2 * i + 1] = b;
                } else {
                    arr[2 * i] = b;
                    arr[2 * i + 1] = a;
                }
            }
        } 
    }
    for (int i = 1; i <= n; i++) {
        cout << arr[i] << " ";
    }
    cout << endl;
    return 0;
}

int32_t main(){ _
    int t;
    // cin >> t;
    t = 1;
    while (t--) solve();
}

Compilation message (stderr)

swap.cpp: In function 'int f(int, int)':
swap.cpp:101:13: warning: unused variable 'b' [-Wunused-variable]
         int b = max(val, arr[2 * ind]);
             ^
swap.cpp:102:13: warning: unused variable 'c' [-Wunused-variable]
         int c = arr[2 * ind + 1];
             ^

• Subtask 1: 10 / 10
• Subtask 2: 11 / 11
• Subtask 3: 27 / 27
• Subtask 4: 20 / 20
• Subtask 5: 32 / 32