Submission #853157

#	Time	Username	Problem	Language	Result	Execution time	Memory
853157		onepunchac168	Arranging Shoes (IOI19_shoes)	C++14	100 / 100	62 ms	17612 KiB

shoes

//------------------------------------\\
//   ------------------------------   \\
//  |  created by Dinh Manh Hung   |  \\
//  |      tht.onepunchac168       |  \\
//  |     THPT CHUYEN HA TINH      |  \\
//  |      HA TINH, VIET NAM       |  \\
//  |           Siuuu              |  \\
//   ------------------------------   \\
//------------------------------------\\

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

#define            task     ""
#define       file(name)    if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
#define             ldb     long double
#define              pb     push_back
#define              eb     emplace_back
#define              fi     first
#define              se     second
#define           all(x)    begin(x),end(x)
#define       uniquev(v)    v.resize(unique(all(v))-v.begin())
#define       rep(i,a,b)    for (int i=a;i<=b;i++)
#define        cntbit(v)    __builtin_popcountll(v)
#define         gcd(a,b)    __gcd(a,b)
#define         lcm(a,b)    ((1LL*a*b)/__gcd(a,b))
#define          mask(x)    (1LL<<(x))
#define     readbit(x,i)    ((x>>i)&1)
#define             Yes     cout << "Yes"
#define             YES     cout << "YES"
#define              No     cout << "No"
#define              NO     cout << "NO"

typedef long long ll;
typedef pair <ll,ll> ii;
typedef pair <ll,ii> iii;
typedef pair <ii,ii> iiii;

ll dx[]= {1,-1,0,0,1,-1,1,-1};
ll dy[]= {0,0,-1,1,1,-1,-1,1};

const ldb PI = acos (-1);
//const ll mod=978846151;
//const ll base=29;
const ll mod=1e9+7;
const char nl = '\n';

inline int ReadInt()
{
    char co;
    for (co = getchar(); co < '0' || co > '9'; co = getchar());
    int xo = co - '0';
    for (co = getchar(); co >= '0' && co <= '9'; co = getchar())
        xo = (xo<<1) + (xo<<3) + co - '0';
    return xo;
}

void WriteInt(int xo)
{
    if (xo > 9)
        WriteInt(xo / 10);
    putchar(xo % 10 + '0');
}

// DEBUG

void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}


#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif


/* END OF TEMPLATE*/

// ================= Solution =================//

/*
void onepunchac168();

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    file(task);
    int tests;
    tests=1;
    //cin>>tests;
    while (tests--)
    {
        onepunchac168();
    }
}

const int N=2e5+5;

void onepunchac168()
{

}
*/

// goodbye see ya

const int N=1e5+5;
ll n;
vector <ll> vt[N];
vector <ll> vta[N];
ll bit[2*N];
void update(int pos,ll val)
{
    while (pos<=2*n)
    {
        bit[pos]+=val;
        pos+=pos&(-pos);
    }
}
ll query(int pos)
{
    ll ans=0;
    while (pos>0)
    {
        ans+=bit[pos];
        pos-=pos&(-pos);
    }
    return ans;
}
long long count_swaps(std::vector<int> s) {
    n=s.size();
    n/=2;
    ll dem=0;
    vector <ii> cnt;
    for (auto v:s)
    {
        dem++;
        if (v>0)
        {
            vt[v].pb(dem);
        }
        else vta[-v].pb(dem);
    }
    ll res=0;
    for (int i=1;i<=n;i++)
    {
        for (int j=0;j<vt[i].size();j++)
        {
            ll aa=vt[i][j];
            ll bb=vta[i][j];
            if (aa>bb)
            {
                swap(aa,bb);
            }
            else
            {
                res++;
            }
            cnt.pb({aa,bb});
        }
    }
    sort(cnt.begin(),cnt.end());
    for (int i=1;i<=2*n;i++)
    {
        update(i,1);
    }
    for (auto v:cnt)
    {
        update(v.fi,-1);
        update(v.se,-1);
        res+=query(v.se)-query(v.fi-1);
    }
    return res;
}

Compilation message (stderr)

shoes.cpp:1:1: warning: multi-line comment [-Wcomment]
    1 | //------------------------------------\\
      | ^
shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:169:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  169 |         for (int j=0;j<vt[i].size();j++)
      |                      ~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 15 / 15