Submission #253498

#	Time	Username	Problem	Language	Result	Execution time	Memory
253498		khangal	Arranging Shoes (IOI19_shoes)	C++14	70 / 100	1068 ms	35576 KiB

shoes

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long ll;
typedef double db;
typedef vector<long long> vl;
typedef pair<long long , long long > pl;
const int N=1e6+1;
#define po pop_back
#define pb push_back
#define mk make_pair
#define lw lower_bound
#define up upper_bound
#define ff first
#define ss second
#define boost ios_base::sync_with_stdio(); cin.tie(0); cout.tie(0);
#define MOD 1000000007
#define MAX 1e18 
#define MIN -1e18
#define rep(i,a,b) for(ll i=a;i<=b;i++)
#define per(i,a,b) for(ll i=b;i>=a;i--)
#define con continue
#define freopen freopen("input.txt", "r", stdin);freopen("output.txt", "w", stdout);
#define PI 3.14159265358979323846264338327950288419716939937510582097494459230781640628
// typedef tree<ll , null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> indexed_set;
// template< typename T>
// using indexed_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
ll sz,n,m,ans,mid,mn,mx,cnt,T,sum,h1,h2,e[1234567],b[1234567],c[1234567],d[1<<20],k,i,j,l,r,h,a[1234567],w,x,y,z;
bool used[1234567];
vector<ll> v[1234567];
ll dx[4]={-1,1,0,0},dy[4]={0,0,-1,1},c1[123][123];
bool check(ll x){
    if(x>=0)return 0;
    else return 1;
}
ll subtask3(vector<int> vec){
    set<ll>st;
    for(auto i: vec)st.insert(abs(i));
    vector<ll> v;
    for(ll i=0;i<vec.size();i++){
        if(vec[i]<0)v.pb(i);
    }
    long long now=0,ans=0;
    for(ll i=0;i<vec.size();i++){
        if(i%2==0){
            ans+=abs(v[now]-i);
            now++;
        }
    }
    return ans;
}
ll count_swaps(vector<int> vec){
    set<ll> st;
    for(auto x:vec) st.insert(abs(x));
    if(st.size()==1){
        return subtask3(vec);
    }
    ll res=0;
    // x=0;
    // rep(i,0,(vec.size()/2)-1){
    //     x+=(vec[i]<0);
    // }
    // if(x==0){
    // res = vec.size()/2;
    // return res*(res-1)/2;}
    x=0;
    for(ll i=0;i<vec.size()-1;i++){
        ll tmp=-1;
        ll j=i+1;
        while(tmp == -1){
            if(vec[j] == -vec[i]){
                tmp = j;
            }
            j++;
        }
        if(check(vec[i])){
            res += (tmp-i-1);
        }
        else{
            res += (tmp-i);
        }
        vec.erase(vec.begin() + tmp);
    }
    return res;
    
}

Compilation message (stderr)

shoes.cpp: In function 'll subtask3(std::vector<int>)':
shoes.cpp:42:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(ll i=0;i<vec.size();i++){
                ~^~~~~~~~~~~
shoes.cpp:46:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(ll i=0;i<vec.size();i++){
                ~^~~~~~~~~~~
shoes.cpp: In function 'll count_swaps(std::vector<int>)':
shoes.cpp:69:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(ll i=0;i<vec.size()-1;i++){
                ~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 0 / 15
• Subtask 5: 20 / 20
• Subtask 6: 0 / 15