Submission #559887

#	Time	Username	Problem	Language	Result	Execution time	Memory
559887		cegax	Arranging Shoes (IOI19_shoes)	C++17	Compilation error	0 ms	0 KiB

shoes

#include <bits/stdc++.h>
using namespace std;
#define all(c) (c).begin(), (c).end()
#define rall(A) A.rbegin(),A.rend()
#define pb push_back 
#define dbg(x) do {cerr << #x <<" = " << (x) << endl; } while (false)
typedef long long ll;
typedef pair<int, int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;
//cout << setprecision(12) << fixed;

struct BIT {
    vector<int> bit;  // binary indexed tree
    int n;

    BIT(int n) {
        this->n = n;
        bit.assign(n, 0);
    }

    BIT(vector<int> a) : BIT(a.size()) {
        for (size_t i = 0; i < a.size(); i++)
            add(i, a[i]);
    }

    int sum(int r) {
        int ret = 0;
        for (; r >= 0; r = (r & (r + 1)) - 1)
            ret += bit[r];
        return ret;
    }

    int sum(int l, int r) {
        return sum(r) - sum(l - 1);
    }

    void add(int idx, int delta) {
        for (; idx < n; idx = idx | (idx + 1))
            bit[idx] += delta;
    }
};

int main() {
	ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int n; cin >> n;
    ll ans = 0;

    vi L[n+1], R[n+1];
    int s[2 * n];

    for(int i = 0; i < 2 * n; i++) {
        cin >> s[i];

        if(s[i] < 0) 
            L[-s[i]].pb(i+1);
        else 
            R[s[i]].pb(i+1);
    }

    int a[2*n + 1];

    bool vis[2 * n + 1];
    memset(vis, 0, sizeof(vis));

    int ind = 1;
    for(int i = 2 * n - 1; i >= 0; i--) {
        if(vis[i]) continue;

        int l, r;

        l = L[abs(s[i])].back();
        r = R[abs(s[i])].back();

        vis[l-1] = vis[r-1] = 1;

        L[abs(s[i])].pop_back();
        R[abs(s[i])].pop_back();
        
        if(l > r) ans++;

        a[l] = a[r] = ind;

        ans += abs(r-l)-1;
        ind++;
    }

    cout << ans << "\n";

    return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/cccK898e.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccBmDBxf.o:shoes.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/cccK898e.o: in function `main':
grader.cpp:(.text.startup+0x2a8): undefined reference to `count_swaps(std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status