Submission #1135908

#	Time	Username	Problem	Language	Result	Execution time	Memory
1135908		t9unkubj	Arranging Shoes (IOI19_shoes)	C++20	100 / 100	307 ms	29372 KiB

shoes

#ifdef t9unkubj
#include"debug.cpp"
//#include"template_no_debug.h"
#else 
#define dbg(...) 199958
#endif

#undef _GLIBCXX_DEBUG
#pragma GCC optimize("O3")
using namespace std;
#include<bits/stdc++.h>
using ll=long long;
using ull=unsigned long long;
template<class T>using vc=vector<T>;
template<class T>using vvc=vc<vc<T>>;
#define rep(i,n) for(ll i=0;i<(ll)(n);i++)
#define REP(i,j,n) for(ll i=(j);i<(ll)(n);i++)
#define DREP(i,n,m) for(ll i=(n);i>=(m);i--)
#define drep(i,n) for(ll i=((n)-1);i>=0;i--)
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
template<class T,class F>
bool chmin(T &x, F y){
    if(x>y){
        x=y;
        return true;
    }
    return false;
}
template<class T, class F>
bool chmax(T &x, F y){
    if(x<y){
        x=y;
        return true;
    }
    return false;
}
double pass_time=0;
#include<vector>
template <class T = long long >
struct BIT {
    int n;
    std::vector<T>data;
    void add(int i,T x){
        assert(i>=0&&i<n);
        i++;
        for(;i<=n;){
            data[i - 1] += x;
            i += (i & -i);
        }
        return;
    }   
    T internal_sum(int r){
        T ret = 0;
        for(;r;){
            ret += data[r - 1];
            r -= (r & -r);
        }
        return ret;
    }
    T sum(int l,int r){
        return internal_sum(r)-internal_sum(l);
    }
    BIT():n(0), data(0) {}
    BIT(int N):n(N), data(N) {}
    BIT(std::vector<T>& a){
        n = a.size();
        data.assign(n, 0);
        for (int i = 0; i < n; i++)add(i, a[i]);
    }
    int lower_bound(T w) { 
    if (w <= 0) {
        return 0;
    } else {
        int x = 0, r = 1;
        while (r < n) r = r << 1;
        for (int len = r; len > 0; len = len >> 1) { 
            if (x + len < n && data[x + len] < w) {
                w -= data[x + len];
                x += len;
            }
        }
        return x;
    }
}
};
#include"shoes.h"
long long count_swaps(vector<int>S){
    int n=S.size();
    map<int,vc<int>>vs;
    rep(i,n){
        vs[S[i]].push_back(i);
    }
    set<pair<int,int>>st;
    for(auto&[x,y]:vs){
        if(x<0)continue;
        rep(j,y.size()){
            int i1=y[j],i2=vs[-x][j];
            st.insert(minmax(i1,i2));
        }
    }
    BIT<int>bit(n);
    rep(i,n){
        bit.add(i,1);
    }
    ll ans=0;
    for(auto&[x,y]:st){
        bit.add(x,-1);
        bit.add(y,-1);
        ans+=bit.sum(0,x);
        ans+=bit.sum(0,y);
        if(S[x]>0)++ans;
    }
    return ans;
}

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