Submission #157691

#	Time	Username	Problem	Language	Result	Execution time	Memory
157691		stefdasca	Pairs (IOI07_pairs)	C++14	70 / 100	2703 ms	321056 KiB

pairs

#include<bits/stdc++.h>
using namespace std;
int tip, n, d, m;
long long ans;


struct tp
{
    int x, y, z;
};
tp vv[10002];
void solvesmall()
{
    for(int i = 1; i <= n; ++i)
    {
        cin >> vv[i].x;
        if(tip >= 2)
            cin >> vv[i].y;
        if(tip >= 3)
            cin >> vv[i].z;
    }
    for(int i = 1; i <= n; ++i)
        for(int j = i+1; j <= n; ++j)
        {
            int dd = abs(vv[i].x - vv[j].x) + abs(vv[i].y - vv[j].y) + abs(vv[i].z - vv[j].z);
            if(dd <= d)
                ++ans;
        }
    cout << ans << '\n';
}

int v[100002];
void solve1()
{
    for(int i = 1; i <= n; ++i)
        cin >> v[i];
    sort(v+1, v+n+1);
    for(int i = 1; i <= n; ++i)
    {
        int sm = i;
        int st = 1;
        int dr = i-1;
        while(st <= dr)
        {
            int mid = (st + dr) / 2;
            if(v[i] - v[mid] <= d)
                sm = mid, dr = mid - 1;
            else
                st = mid + 1;
        }
        ans += (i - sm);
    }
    cout << ans << '\n';
}

pair<int, int> nr[100002];
int aib[401][200002];
vector<int>coord[150002];
void upd(int bu, int pz, int val)
{
    aib[bu][pz] += val;
    // for(; pz <= 200000; pz += (pz & (-pz)))
       //  aib[bu][pz] += val;
}
int compute(int bu, int pz)
{
    pz = max(pz, 0);
    pz = min(pz, 200000);
    return aib[bu][pz];
    int ans = 0;
    for(; pz > 0; pz -= (pz & (-pz)))
        ans += aib[bu][pz];
    return ans;
}
int cb(int linie, int col)
{
    int ans = 0;
    int st = 0;
    int dr = coord[linie].size() - 1;
    if(coord[linie].back() <= col)
        return coord[linie].size();
    if(coord[linie][0] > col)
        return 0;
    while(st <= dr)
    {
        int mid = (st + dr) / 2;
        if(coord[linie][mid] <= col)
            ans = (mid + 1), st = mid + 1;
        else
            dr = mid - 1;
    }
    return ans;
}
void solve2()
{
    int buk = 400;
    for(int i = 1; i <= n; ++i)
    {
        int x, y;
        cin >> x >> y;
      //  x = min(i, 75000);
       // y = min(i, 75000);
        nr[i].first = x + y;
        nr[i].second = x - y + 100000;
        coord[nr[i].first].push_back(nr[i].second);
        int nrbuk = nr[i].first / buk + (nr[i].first % buk > 0);
        upd(nrbuk, nr[i].second, 1);
    }
    for(int i = 1; i <= 400; ++i)
        for(int j = 1; j <= 200000; ++j)
            aib[i][j] += aib[i][j-1];
   // cout << nr[5].first << '\n';
    for(int i = 0; i <= 150000; ++i)
        sort(coord[i].begin(), coord[i].end());
    for(int i = 1; i <= n; ++i)
    {
      //  if(i <= 10)
      //      cout << nr[i].first << '\n';
        int st = max(1, nr[i].first - d);
        int sf = min(150000, nr[i].first + d);
        int nrbuk = st / buk + (st % buk > 0);
        --ans;
       // if(i <= 10)
        //    cout << nr[i].first << " " << st << " " << buk << " " << sf << '\n';
        while(st <= sf && st <= nrbuk * buk)
        {
            if(!coord[st].empty())
                ans += cb(st, nr[i].second + d) - cb(st, nr[i].second - d - 1);
            ++st;
        }
        int gn = 0;
       // if(i <= 10)
        //    cout << st << " " << buk << " " << sf << '\n';
        while(st + buk - 1 <= sf)
        {
            nrbuk = st / buk + (st % buk > 0);
            gn += compute(nrbuk, nr[i].second + d) - compute(nrbuk, nr[i].second - d - 1);
            ans += compute(nrbuk, nr[i].second + d) - compute(nrbuk, nr[i].second - d - 1);
            st += buk;
        }
       // if(i <= 10)
       //     cout << gn << '\n';
        while(st <= sf)
        {
            if(!coord[st].empty())
                ans += cb(st, nr[i].second + d) - cb(st, nr[i].second - d - 1);
            ++st;
        }
    }
    cout << ans / 2 << '\n';
}

void solve3()
{

}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> tip >> n >> d >> m;
    if(tip == 1)
        solve1();
    else
        if(n <= 20000)
            solvesmall();
        else
            if(tip == 2)
                solve2();
            else
                if(tip == 3)
                    solve3();
    return 0;
}

• Subtask 1: 6 / 6
• Subtask 2: 6 / 6
• Subtask 3: 6 / 6
• Subtask 4: 6 / 6
• Subtask 5: 6 / 6
• Subtask 6: 7 / 7
• Subtask 7: 7 / 7
• Subtask 8: 8 / 8
• Subtask 9: 8 / 8
• Subtask 10: 10 / 10
• Subtask 11: 0 / 10
• Subtask 12: 0 / 10
• Subtask 13: 0 / 10