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Submission #829655

# Submission time Handle Problem Language Result Execution time Memory
829655 2023-08-18T13:50:40 Z Abrar_Al_Samit Fountain Parks (IOI21_parks) C++17
15 / 100
 899 ms 50436 KB 
#include <bits/stdc++.h>
#include "parks.h"
using namespace std;

const int nax = 200000;
vector<int>g[nax];
bool vis[nax];
int par[nax], sz[nax];

void trav(int v) {
    vis[v] = 1;
    for(int u : g[v]) if(!vis[u]) {
        trav(u);
    }
}

int find(int v) {
    return par[v] = (v==par[v]) ? v : find(par[v]);
}
void unite(int u, int v) {
    u = find(u), v = find(v);
    if(sz[u] < sz[v]) swap(u, v);
    sz[u] += sz[v];
    par[v] = u;
}
int construct_roads(vector<int> x, vector<int> y) {
    int n = x.size();
    map<pair<int,int>, int>ft;
    for(int i=0; i<n; ++i) {
        ft[{x[i], y[i]}] = i;
    }

    int dx[] = {2, -2, 0, 0};
    int dy[] = {0, 0, 2, -2};

    vector<int>u, v, a, b;

    map<pair<int,int>, int>ben;

    for(int i=0; i<n; ++i) {
        par[i] = i, sz[i] = 1;
    }
    for(int i=0; i<n; ++i) {
        for(int j=0; j<4; ++j) {
            int nx = x[i] + dx[j], ny = y[i] + dy[j];
            if(ft.count(make_pair(nx, ny))) {
                if(find(i) == find(ft[{nx, ny}])) continue;

                

                if(j < 2) { //horizontal
                    if((x[i] + nx >> 1) < 4) {
                        if(!ben.count(make_pair(x[i] + nx >> 1, ny - 1))) {
                            ben[{x[i] + nx >> 1, ny - 1}] = 1;
                            a.push_back(x[i] + nx >> 1);
                            b.push_back(ny - 1);
                        } else if(!ben.count(make_pair(x[i] + nx >> 1, ny + 1))) {
                            ben[{x[i] + nx >> 1, ny + 1}] = 1;
                            a.push_back(x[i] + nx >> 1);
                            b.push_back(ny + 1);

                        } else return 0;
                    } else {
                        if(!ben.count(make_pair(x[i] + nx >> 1, ny + 1))) {
                            ben[{x[i] + nx >> 1, ny + 1}] = 1;
                            a.push_back(x[i] + nx >> 1);
                            b.push_back(ny + 1);

                        } else if(!ben.count(make_pair(x[i] + nx >> 1, ny - 1))) {
                            ben[{x[i] + nx >> 1, ny - 1}] = 1;
                            a.push_back(x[i] + nx >> 1);
                            b.push_back(ny - 1);
                        } else return 0;                    
                    }
                } else { //vertical
                    if(x[i]==2) {
                        a.push_back(x[i] - 1);
                        b.push_back(y[i] + ny >> 1);
                    } else if(x[i]==6) {
                        a.push_back(x[i] + 1);
                        b.push_back(y[i] + ny >> 1);
                    } else {
                        continue;
                    }
                }
                g[i].push_back(ft[{nx, ny}]);
                g[ft[{nx, ny}]].push_back(i);
                unite(i, ft[{nx, ny}]);
                u.push_back(i);
                v.push_back(ft[{nx, ny}]);
            }
        }
    }
    for(int i=0; i<n; ++i) {
        for(int j=2; j<4; ++j) {
            int nx = x[i] + dx[j], ny = y[i] + dy[j];
            if(ft.count(make_pair(nx, ny))) {
                if(find(i) == find(ft[{nx, ny}])) continue;

                g[i].push_back(ft[{nx, ny}]);
                g[ft[{nx, ny}]].push_back(i);
                unite(i, ft[{nx, ny}]);
                u.push_back(i);
                v.push_back(ft[{nx, ny}]);

                if(!ben.count(make_pair(nx-1, y[i] + ny >> 1))) {
                    ben[{nx-1, y[i] + ny >> 1}] = 1;
                    a.push_back(nx-1);
                    b.push_back(y[i] + ny >> 1);
                } else if(!ben.count(make_pair(nx+1, y[i] + ny >> 1))) {
                    ben[{nx+1, y[i] + ny >> 1}] = 1;
                    a.push_back(nx+1);
                    b.push_back(y[i] + ny >> 1);
                } else return 0;
            }
        }
    }
    trav(0);
    for(int i=0; i<n; ++i) if(!vis[i]) {
        return 0;
    }

    build(u, v, a, b);
    return 1;
}

Compilation message

parks.cpp: In function 'int construct_roads(std::vector<int>, std::vector<int>)':
parks.cpp:52:30: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   52 |                     if((x[i] + nx >> 1) < 4) {
parks.cpp:53:54: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   53 |                         if(!ben.count(make_pair(x[i] + nx >> 1, ny - 1))) {
parks.cpp:54:39: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   54 |                             ben[{x[i] + nx >> 1, ny - 1}] = 1;
parks.cpp:55:46: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   55 |                             a.push_back(x[i] + nx >> 1);
parks.cpp:57:61: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   57 |                         } else if(!ben.count(make_pair(x[i] + nx >> 1, ny + 1))) {
parks.cpp:58:39: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   58 |                             ben[{x[i] + nx >> 1, ny + 1}] = 1;
parks.cpp:59:46: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   59 |                             a.push_back(x[i] + nx >> 1);
parks.cpp:64:54: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   64 |                         if(!ben.count(make_pair(x[i] + nx >> 1, ny + 1))) {
parks.cpp:65:39: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   65 |                             ben[{x[i] + nx >> 1, ny + 1}] = 1;
parks.cpp:66:46: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   66 |                             a.push_back(x[i] + nx >> 1);
parks.cpp:69:61: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   69 |                         } else if(!ben.count(make_pair(x[i] + nx >> 1, ny - 1))) {
parks.cpp:70:39: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   70 |                             ben[{x[i] + nx >> 1, ny - 1}] = 1;
parks.cpp:71:46: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   71 |                             a.push_back(x[i] + nx >> 1);
parks.cpp:78:42: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   78 |                         b.push_back(y[i] + ny >> 1);
parks.cpp:81:42: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   81 |                         b.push_back(y[i] + ny >> 1);
parks.cpp:106:52: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  106 |                 if(!ben.count(make_pair(nx-1, y[i] + ny >> 1))) {
parks.cpp:107:37: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  107 |                     ben[{nx-1, y[i] + ny >> 1}] = 1;
parks.cpp:109:38: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  109 |                     b.push_back(y[i] + ny >> 1);
parks.cpp:110:59: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  110 |                 } else if(!ben.count(make_pair(nx+1, y[i] + ny >> 1))) {
parks.cpp:111:37: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  111 |                     ben[{nx+1, y[i] + ny >> 1}] = 1;
parks.cpp:113:38: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  113 |                     b.push_back(y[i] + ny >> 1);

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4980 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 258 ms 23080 KB Output is correct
10 Correct 16 ms 7060 KB Output is correct
11 Correct 101 ms 14812 KB Output is correct
12 Correct 25 ms 8032 KB Output is correct
13 Correct 72 ms 11424 KB Output is correct
14 Correct 4 ms 5076 KB Output is correct
15 Correct 5 ms 5204 KB Output is correct
16 Correct 261 ms 22388 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4980 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 258 ms 23080 KB Output is correct
10 Correct 16 ms 7060 KB Output is correct
11 Correct 101 ms 14812 KB Output is correct
12 Correct 25 ms 8032 KB Output is correct
13 Correct 72 ms 11424 KB Output is correct
14 Correct 4 ms 5076 KB Output is correct
15 Correct 5 ms 5204 KB Output is correct
16 Correct 261 ms 22388 KB Output is correct
17 Correct 2 ms 4948 KB Output is correct
18 Correct 2 ms 4948 KB Output is correct
19 Correct 2 ms 4948 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 2 ms 4948 KB Output is correct
22 Correct 2 ms 4948 KB Output is correct
23 Correct 899 ms 45848 KB Output is correct
24 Correct 2 ms 4948 KB Output is correct
25 Correct 4 ms 5204 KB Output is correct
26 Correct 7 ms 5460 KB Output is correct
27 Correct 9 ms 5664 KB Output is correct
28 Correct 258 ms 21388 KB Output is correct
29 Correct 412 ms 29424 KB Output is correct
30 Correct 641 ms 37804 KB Output is correct
31 Correct 887 ms 45708 KB Output is correct
32 Correct 2 ms 4948 KB Output is correct
33 Correct 2 ms 4948 KB Output is correct
34 Correct 2 ms 4948 KB Output is correct
35 Correct 2 ms 4948 KB Output is correct
36 Correct 2 ms 4948 KB Output is correct
37 Correct 2 ms 4948 KB Output is correct
38 Correct 2 ms 4948 KB Output is correct
39 Correct 2 ms 4920 KB Output is correct
40 Correct 2 ms 4948 KB Output is correct
41 Correct 2 ms 4948 KB Output is correct
42 Correct 2 ms 4948 KB Output is correct
43 Correct 5 ms 5280 KB Output is correct
44 Correct 7 ms 5460 KB Output is correct
45 Correct 322 ms 26736 KB Output is correct
46 Correct 589 ms 36636 KB Output is correct
47 Correct 582 ms 36564 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4980 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 258 ms 23080 KB Output is correct
10 Correct 16 ms 7060 KB Output is correct
11 Correct 101 ms 14812 KB Output is correct
12 Correct 25 ms 8032 KB Output is correct
13 Correct 72 ms 11424 KB Output is correct
14 Correct 4 ms 5076 KB Output is correct
15 Correct 5 ms 5204 KB Output is correct
16 Correct 261 ms 22388 KB Output is correct
17 Correct 2 ms 4948 KB Output is correct
18 Correct 2 ms 4948 KB Output is correct
19 Correct 2 ms 4948 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 2 ms 4948 KB Output is correct
22 Correct 2 ms 4948 KB Output is correct
23 Correct 899 ms 45848 KB Output is correct
24 Correct 2 ms 4948 KB Output is correct
25 Correct 4 ms 5204 KB Output is correct
26 Correct 7 ms 5460 KB Output is correct
27 Correct 9 ms 5664 KB Output is correct
28 Correct 258 ms 21388 KB Output is correct
29 Correct 412 ms 29424 KB Output is correct
30 Correct 641 ms 37804 KB Output is correct
31 Correct 887 ms 45708 KB Output is correct
32 Correct 2 ms 4948 KB Output is correct
33 Correct 2 ms 4948 KB Output is correct
34 Correct 2 ms 4948 KB Output is correct
35 Correct 2 ms 4948 KB Output is correct
36 Correct 2 ms 4948 KB Output is correct
37 Correct 2 ms 4948 KB Output is correct
38 Correct 2 ms 4948 KB Output is correct
39 Correct 2 ms 4920 KB Output is correct
40 Correct 2 ms 4948 KB Output is correct
41 Correct 2 ms 4948 KB Output is correct
42 Correct 2 ms 4948 KB Output is correct
43 Correct 5 ms 5280 KB Output is correct
44 Correct 7 ms 5460 KB Output is correct
45 Correct 322 ms 26736 KB Output is correct
46 Correct 589 ms 36636 KB Output is correct
47 Correct 582 ms 36564 KB Output is correct
48 Correct 2 ms 4948 KB Output is correct
49 Correct 2 ms 4948 KB Output is correct
50 Correct 2 ms 4948 KB Output is correct
51 Correct 2 ms 4948 KB Output is correct
52 Correct 2 ms 4948 KB Output is correct
53 Correct 3 ms 4948 KB Output is correct
54 Incorrect 2 ms 4948 KB Solution announced impossible, but it is possible.
55 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4980 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 258 ms 23080 KB Output is correct
10 Correct 16 ms 7060 KB Output is correct
11 Correct 101 ms 14812 KB Output is correct
12 Correct 25 ms 8032 KB Output is correct
13 Correct 72 ms 11424 KB Output is correct
14 Correct 4 ms 5076 KB Output is correct
15 Correct 5 ms 5204 KB Output is correct
16 Correct 261 ms 22388 KB Output is correct
17 Correct 2 ms 4948 KB Output is correct
18 Correct 2 ms 4948 KB Output is correct
19 Correct 2 ms 4948 KB Output is correct
20 Incorrect 688 ms 39388 KB Solution announced impossible, but it is possible.
21 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4980 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 258 ms 23080 KB Output is correct
10 Correct 16 ms 7060 KB Output is correct
11 Correct 101 ms 14812 KB Output is correct
12 Correct 25 ms 8032 KB Output is correct
13 Correct 72 ms 11424 KB Output is correct
14 Correct 4 ms 5076 KB Output is correct
15 Correct 5 ms 5204 KB Output is correct
16 Correct 261 ms 22388 KB Output is correct
17 Correct 774 ms 50436 KB Output is correct
18 Incorrect 544 ms 37592 KB Solution announced impossible, but it is possible.
19 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4980 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 2 ms 4948 KB Output is correct
9 Correct 258 ms 23080 KB Output is correct
10 Correct 16 ms 7060 KB Output is correct
11 Correct 101 ms 14812 KB Output is correct
12 Correct 25 ms 8032 KB Output is correct
13 Correct 72 ms 11424 KB Output is correct
14 Correct 4 ms 5076 KB Output is correct
15 Correct 5 ms 5204 KB Output is correct
16 Correct 261 ms 22388 KB Output is correct
17 Correct 2 ms 4948 KB Output is correct
18 Correct 2 ms 4948 KB Output is correct
19 Correct 2 ms 4948 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 2 ms 4948 KB Output is correct
22 Correct 2 ms 4948 KB Output is correct
23 Correct 899 ms 45848 KB Output is correct
24 Correct 2 ms 4948 KB Output is correct
25 Correct 4 ms 5204 KB Output is correct
26 Correct 7 ms 5460 KB Output is correct
27 Correct 9 ms 5664 KB Output is correct
28 Correct 258 ms 21388 KB Output is correct
29 Correct 412 ms 29424 KB Output is correct
30 Correct 641 ms 37804 KB Output is correct
31 Correct 887 ms 45708 KB Output is correct
32 Correct 2 ms 4948 KB Output is correct
33 Correct 2 ms 4948 KB Output is correct
34 Correct 2 ms 4948 KB Output is correct
35 Correct 2 ms 4948 KB Output is correct
36 Correct 2 ms 4948 KB Output is correct
37 Correct 2 ms 4948 KB Output is correct
38 Correct 2 ms 4948 KB Output is correct
39 Correct 2 ms 4920 KB Output is correct
40 Correct 2 ms 4948 KB Output is correct
41 Correct 2 ms 4948 KB Output is correct
42 Correct 2 ms 4948 KB Output is correct
43 Correct 5 ms 5280 KB Output is correct
44 Correct 7 ms 5460 KB Output is correct
45 Correct 322 ms 26736 KB Output is correct
46 Correct 589 ms 36636 KB Output is correct
47 Correct 582 ms 36564 KB Output is correct
48 Correct 2 ms 4948 KB Output is correct
49 Correct 2 ms 4948 KB Output is correct
50 Correct 2 ms 4948 KB Output is correct
51 Correct 2 ms 4948 KB Output is correct
52 Correct 2 ms 4948 KB Output is correct
53 Correct 3 ms 4948 KB Output is correct
54 Incorrect 2 ms 4948 KB Solution announced impossible, but it is possible.
55 Halted 0 ms 0 KB -