oj.uz

Submission #493858

# Submission time Handle Problem Language Result Execution time Memory
493858 2021-12-13T08:23:28 Z LittleCube Roads (CEOI20_roads) C++14
100 / 100
 303 ms 12152 KB 
#include <bits/extc++.h>
#include <bits/stdc++.h>
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define F first
#define S second
using namespace std;
using namespace __gnu_pbds;

int N, vis[200005];
pll p[100005][2];
pii ans[100005];
vector<pii> v;

int curx = -1e8;
struct sort_by_y
{
    double intersect(int a, int x) const
    {
        if (p[a][0].F == p[a][1].F)
            return (p[a][0].S + p[a][1].S) / 2;
        
        return p[a][0].S + double(p[a][1].S - p[a][0].S) * double(x - p[a][0].F) / double(p[a][1].F - p[a][0].F);
    }
    bool operator()(int a, int b) const
    {
        int curx = max(p[a][0].F, p[b][0].F);
        if (p[a][0].F == p[a][1].F)
            curx = p[a][0].F;
        if (p[b][0].F == p[b][1].F)
            curx = p[b][0].F;
        return intersect(a, curx) < intersect(b, curx);
    }
};

map<int, pii, sort_by_y> sweep;

signed main()
{
    cin >> N;
    for (int i = 1; i <= N; i++)
        cin >> p[i][0].F >> p[i][0].S >> p[i][1].F >> p[i][1].S;
    for (int i = 1; i <= N; i++)
        if (p[i][0] > p[i][1])
            swap(p[i][0], p[i][1]);
    for (int i = 1; i <= N; i++)
    {
        v.emplace_back(pii{i, 0});
        v.emplace_back(pii{i, 1});
    }
    p[0][0] = pii{-1e8, 1e8}, p[0][1] = pii{1e8, 1e8};
    sort(v.begin(), v.end(), [&](pii p1, pii p2)
         {/*
             if (p[p1.F][p1.S].F == p[p2.F][p2.S].F)
             {
                 if (p1.F == p2.F)
                     return p1.S < p2.S;
                 return p1.S > p2.S;
             }
             else*/
                 return p[p1.F][p1.S]/*.F*/ < p[p2.F][p2.S]/*.F*/;
         });
    sweep[0] = {0, 0};
    for (int i = 0; i < v.size(); i++)
    {
        
        if (v[i].S == 1)
        {
            //cout << "remove " << v[i].F << '\n';
            auto iter = sweep.erase(sweep.find(v[i].F));
            sweep[iter->F] = v[i];
        }
        else
        {
            //cout << "insert " << v[i].F << '\n';
            auto iter = sweep.upper_bound(v[i].F);
            ans[v[i].F] = sweep[iter->F];
            //cout << "...with answer " << ans[v[i].F].F << " " << ans[v[i].F].S << '\n';
            sweep[v[i].F] = v[i];
            iter = sweep.upper_bound(v[i].F);
            sweep[iter->F] = v[i];
        }
    }

    for (int i = 1; i <= N; i++)
        if(ans[i] != pii{0, 0})
            cout << p[i][0].F << " " << p[i][0].S << " " << p[ans[i].F][ans[i].S].F << " " << p[ans[i].F][ans[i].S].S << "\n";
}

/*
4 
1 1 3 2
1 3 5 3
6 1 5 5
1 4 4 5
*/

Compilation message

roads.cpp: In function 'int main()':
roads.cpp:65:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |     for (int i = 0; i < v.size(); i++)
      |                     ~~^~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 135 ms 3320 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 4 ms 332 KB Output is correct
4 Correct 20 ms 1476 KB Output is correct
5 Correct 39 ms 2612 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 2 ms 332 KB Output is correct
4 Correct 19 ms 1472 KB Output is correct
5 Correct 40 ms 2616 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 304 KB Output is correct
8 Correct 4 ms 440 KB Output is correct
9 Correct 23 ms 1532 KB Output is correct
10 Correct 290 ms 11804 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 3 ms 332 KB Output is correct
4 Correct 26 ms 1488 KB Output is correct
5 Correct 42 ms 2632 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 3 ms 404 KB Output is correct
9 Correct 28 ms 1516 KB Output is correct
10 Correct 107 ms 6016 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 3 ms 332 KB Output is correct
5 Correct 24 ms 1480 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 2 ms 332 KB Output is correct
9 Correct 22 ms 1468 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 2 ms 332 KB Output is correct
13 Correct 29 ms 1552 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 332 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 2 ms 332 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 9 ms 716 KB Output is correct
23 Correct 10 ms 716 KB Output is correct
24 Correct 21 ms 1156 KB Output is correct
25 Correct 1 ms 204 KB Output is correct

Subtask #6
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 98 ms 3312 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 3 ms 332 KB Output is correct
6 Correct 21 ms 1460 KB Output is correct
7 Correct 43 ms 2668 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 308 KB Output is correct
10 Correct 3 ms 332 KB Output is correct
11 Correct 23 ms 1464 KB Output is correct
12 Correct 303 ms 11684 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 2 ms 332 KB Output is correct
16 Correct 20 ms 1552 KB Output is correct
17 Correct 106 ms 6028 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 1 ms 332 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 1 ms 332 KB Output is correct
24 Correct 2 ms 332 KB Output is correct
25 Correct 1 ms 204 KB Output is correct
26 Correct 9 ms 644 KB Output is correct
27 Correct 9 ms 716 KB Output is correct
28 Correct 25 ms 1128 KB Output is correct
29 Correct 171 ms 7340 KB Output is correct
30 Correct 226 ms 10952 KB Output is correct
31 Correct 1 ms 204 KB Output is correct
32 Correct 196 ms 8156 KB Output is correct
33 Correct 201 ms 8100 KB Output is correct
34 Correct 278 ms 10660 KB Output is correct
35 Correct 295 ms 11156 KB Output is correct
36 Correct 298 ms 12152 KB Output is correct