Submission #471186

#	Time	Username	Problem	Language	Result	Execution time	Memory
471186		NhatMinh0208	Cheerleaders (info1cup20_cheerleaders)	C++14	54 / 100	725 ms	3532 KiB

cheerleaders

#ifndef CPL_TEMPLATE
#define CPL_TEMPLATE
/*
	Normie's Template v2.5
	Changes:
    Added warning against using pragmas on USACO.
*/
// Standard library in one include.
#include <bits/stdc++.h>
using namespace std;
 
// ordered_set library.
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ordered_set(el) tree<el,null_type,less<el>,rb_tree_tag,tree_order_statistics_node_update>
 
// AtCoder library. (Comment out these two lines if you're not submitting in AtCoder.) (Or if you want to use it in other judges, run expander.py first.)
//#include <atcoder/all>
//using namespace atcoder;

//Pragmas (Comment out these three lines if you're submitting in szkopul or USACO.)
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast,unroll-loops,tree-vectorize")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
 
//File I/O.
#define FILE_IN "cseq.inp"
#define FILE_OUT "cseq.out"
#define ofile freopen(FILE_IN,"r",stdin);freopen(FILE_OUT,"w",stdout)
 
//Fast I/O.
#define fio ios::sync_with_stdio(0);cin.tie(0)
#define nfio cin.tie(0)
#define endl "\n"
 
//Order checking.
#define ord(a,b,c) ((a>=b)and(b>=c))
 
//min/max redefines, so i dont have to resolve annoying compile errors.
#define min(a,b) (((a)<(b))?(a):(b))
#define max(a,b) (((a)>(b))?(a):(b))

// Fast min/max assigns to use with AVX.
// Requires g++ 9.2.0.
template<typename T>
__attribute__((always_inline)) void chkmin(T& a, const T& b) {
    a=(a<b)?a:b;
}

template<typename T>
__attribute__((always_inline)) void chkmax(T& a, const T& b) {
    a=(a>b)?a:b;
}
 
//Constants.
#define MOD (ll(998244353))
#define MAX 300001
#define mag 320
const long double PI=3.14159265358979;
 
//Pairs and 3-pairs.
#define p1 first
#define p2 second.first
#define p3 second.second
#define fi first
#define se second
#define pii(element_type) pair<element_type,element_type>
#define piii(element_type) pair<element_type,pii(element_type)>
 
//Quick power of 2.
#define pow2(x) (ll(1)<<x)
 
//Short for-loops.
#define ff(i,__,___) for(int i=__;i<=___;i++)
#define rr(i,__,___) for(int i=__;i>=___;i--)
 
//Typedefs.
#define bi BigInt
typedef long long ll;
typedef long double ld;
typedef short sh;

// Binpow and stuff
ll BOW(ll a, ll x, ll p)
{
	if (!x) return 1;
	ll res=BOW(a,x/2,p);
	res*=res;
	res%=p;
	if (x%2) res*=a;
	return res%p;
}
ll INV(ll a, ll p)
{
	return BOW(a,p-2,p);
}
//---------END-------//
#endif
vector<int> vec;
int n,m,i,j,k,t,t1,u,v,a,b;
ll cur,minn;
int cb,cs;
int mb,ms;
int pos[100001];
int arr[100001];
ll val[17][2];
void tri(int x, vector<int> v) {
    vector<int> vv[2];
    ll a=0,b=0;
    int xx=(x+t)%n;
    for (auto g : v) {
        if (g&(1<<xx)) {
            a++;
            vv[1].push_back(g);
        }
        else {
            b+=a;
            vv[0].push_back(g);
        }
    }
    val[x][0]+=b;
    val[x][1]+=(ll)(vv[0].size())*((ll)(vv[1].size()))-b;
    if (x) {
        tri(x-1,vv[0]);
        tri(x-1,vv[1]);
    }
}
int main()
{
	fio;
    cin>>n;
    if (n==0) {cout<<0; return 0;}
    for (i=0;i<(1<<n);i++) {
        cin>>u;
        arr[u]=i;
    }
    for (i=0;i<(1<<n);i++) {
        vec.push_back(arr[i]);
    }
    minn=1e18;
    for (t=0;t<n;t++) {
        cur=0;
        cb=0;
        cs=t;
        for (i=0;i<n;i++) val[i][0]=val[i][1]=0;
        tri(n-1,vec);
        for (i=0;i<n;i++) {
            if (val[i][0]>val[i][1]) {
                cb^=(1<<i);
            }
            cur+=min(val[i][0],val[i][1]);
        }
        if (cur<minn) {
            ms=cs;
            mb=cb;
        }
        minn=min(minn,cur);
    }
    cout<<minn<<endl;
    u=0;
    for (i=0;i<ms;i++) {
        v=u&1;
        u>>=1;
        u^=(1<<(n-1))*u; 
        cout<<2;
    }
    for (i=n-1;i>=0;i--) {
        if ((mb&(1<<i)) == (u&(1<<i)))
        {
            cout<<2<<1;
        }
        else cout<<2;
    }
}
// Normie28;

Compilation message (stderr)

cheerleaders.cpp:23: warning: ignoring '#pragma comment ' [-Wunknown-pragmas]
   23 | #pragma comment(linker, "/stack:200000000")
      |

• Subtask 1: 8 / 16
• Subtask 2: 5 / 10
• Subtask 3: 20 / 25
• Subtask 4: 0 / 21
• Subtask 5: 21 / 28