Submission #1293119

#	Time	Username	Problem	Language	Result	Execution time	Memory
1293119		trandaihao5555	Arranging Shoes (IOI19_shoes)	C++20	Compilation error	0 ms	0 KiB

shoes

#include <bits/stdc++.h>
#include "shoes.h"

 #define int long long

#define debug     cout << "ok\n";
#define SQR(x)    (1LL * ((x) * (x)))
#define MASK(i)   (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
#define fi        first
#define se        second
#define pb        push_back

#define mp make_pair
#define pii pair<int,int>
#define pli pair<ll,int>
#define vi vector<int>

#define FAST ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef unsigned int ui;

using namespace std;

const int M = 1e9 + 7;
const int INF = 1e9 + 7;
const ll INFLL = (ll)2e18 + 7LL;
const ld PI = acos(-1);

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

template<class _, class __>
    bool minimize(_ &x, const __ y){
        if(x > y){
            x = y;
            return true;
        } else return false;
    }
template<class _, class __>
    bool maximize(_ &x, const __ y){
        if(x < y){
            x = y;
            return true;
        } else return false;
    }

template<class _,class __>
    void Add(_ &x, const __ y) {
        x += y;
        if (x >= M) {
            x -= M;
        }
        return;
    }

template<class _,class __>
    void Diff(_ &x, const __ y) {
        x -= y;
        if (x < 0) {
            x += M;
        }
        return;
    }

//--------------------------------------------------------------

const int MaxN = 5e5+7;

vi nen;
multiset<int> lis[MaxN][2];
bool ch[MaxN];

struct FenwickTree {
    int Tr[MaxN];

    void Upd(int u,int v) {
        u++;
        for (; u < MaxN; u += u&-u) {
            Tr[u]+=v;
        }
        return;
    }

    int Get(int u) {
        u++;
        if (u < 0) return 0;
        int res = 0;
        for (; u; u -= u&-u) {
            res += Tr[u];
        }
        return res;
    }
} Fw;

int count_swaps(vector<int32_t> s) {
    vector<int32_t> S = s;
    for (int x : S) nen.pb(abs(x));
    sort(nen.begin(),nen.end());
    nen.erase(unique(nen.begin(),nen.end()),nen.end());
    for (int i=0;i<S.size();i++) {
        int & x = S[i];
        int tmp = x / abs(x);
        if (tmp == -1) tmp = 0;
        x = lower_bound(nen.begin(),nen.end(),abs(x)) - nen.begin() + 1;
        lis[x][tmp].insert(i);
    }
    vi res;
    for (int i=0;i<S.size();i++) {
        if (ch[i]) continue;
        res.pb(*lis[S[i]][0].begin());
        res.pb(*lis[S[i]][1].begin());
        ch[*lis[S[i]][0].begin()] = true;
        ch[*lis[S[i]][1].begin()] = true;
        lis[S[i]][0].erase(lis[S[i]][0].begin());
        lis[S[i]][1].erase(lis[S[i]][1].begin());
    }
    reverse(res.begin(),res.end());
    ll ans = 0;
    for (int x : res) {
        ans += Fw.Get(x);
        Fw.Upd(x,1);
    }
    return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:105:22: error: cannot bind non-const lvalue reference of type 'long long int&' to a value of type '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'}
  105 |         int & x = S[i];
      |                      ^