oj.uz

Submission #1073088

# Submission time Handle Problem Language Result Execution time Memory
1073088 2024-08-24T09:23:10 Z cadmiumsky The Ties That Guide Us (CEOI23_incursion) C++17
60 / 100
 281 ms 15124 KB 
#include <vector>
#include "incursion.h"
#include <cstdio>

#include <bits/stdc++.h>
#define all(x) (x).begin(),(x).end()
using namespace std;

#define sz(x) ((int)(x).size())

using pii = pair<int, int>;
using tii = tuple<int, int, int>;



const int nmax = 45e3 + 5;

vector<int> g[nmax];

int area[nmax];
int father[nmax];
#define N uhasfuhafs
int N;

void initarea(int node, int f) {
   area[node] = 1;
   father[node] = f;
   for(auto x : g[node]) {
      if(x == f) continue;
      initarea(x, node);
      area[node] += area[x];
   }
   return;
}
pii findcentr(int node, int f) {
   for(auto x : g[node]) {
      if(x == f) continue;
      if(area[x] * 2 == N) { return pii{node, x}; }
      if(area[x] * 2 > N) { return findcentr(x, node); }
   }
   return pii{node, node};
}

int make_graph(vector<pii> F) {
   for(auto &[a, b] : F) --a, --b;
   N = sz(F) + 1;
   for(int i = 0; i <= N + 1; i++) g[i].clear();
   
   for(auto [a, b] : F) {
      g[a].emplace_back(b);
      g[b].emplace_back(a);
   }
   
   int cnt = 0;
   for(int i = 0; i < N; i++) {
      if(sz(g[i]) == 2) cnt++;
   }
   if(cnt == 1) {      
      for(int i = 0; i < N; i++)
         if(sz(g[i]) == 2) return i;
   }
   
   initarea(0, 0);
   auto [u_, v_] = findcentr(0, 0);
   int root;
   
   if(u_ != v_) {
      for(int i = 0; i < sz(g[u_]); i++) {
         if(g[u_][i] == v_) {
            swap(g[u_][i], g[u_].back());
            g[u_].pop_back();
            break;
         }
      }
      for(int i = 0; i < sz(g[v_]); i++) {
         if(g[v_][i] == u_) {
            swap(g[v_][i], g[v_].back());
            g[v_].pop_back();
            break;
         }
      }
      g[u_].emplace_back(N);
      g[v_].emplace_back(N);
      g[N].emplace_back(u_);
      g[N].emplace_back(v_);
      N++;
      root = N - 1;
   }
   else { root = u_; }
   
   initarea(root, root);
   for(auto x : g[root])
      assert(area[x] * 2 < N);
   
   return root;
}

vector<int> known;

bool dfs(int node, int f, int where) {
   bool znayu = node == where;
   for(auto x : g[node]) {
      if(x == f) continue;
      znayu |= dfs(x, node, where);
   }
   known[node] = znayu;
   return known[node];
}

std::vector<int> mark(std::vector<std::pair<int, int>> F, int safe) {
   --safe;
   int root = make_graph(F);
   known.resize(N);
   dfs(root, root, safe);
   //cerr << root + 1 << '\n';
   known.resize(sz(F) + 1);
   return known;
}

int go(int x) {
   return visit(x +1);
}

void locate(std::vector<std::pair<int, int>> F, int curr, int t) {
   --curr;
   int root = make_graph(F);
   //for(int i = 0; i< N; i++) {
      //cerr << i << ": ";
      //for(auto x : g[i]) cerr << x << ' ';
      //cerr << '\n';
   //}
   known.assign(N, -1);
   if(N != sz(F) + 1)
      known.back() = 1;
   initarea(root, root);
   
   while(1) {
      if(t == 0) {
         int u = father[curr];
         if(u == sz(F) + 1) {
            curr = g[u][0] ^ g[u][1] ^ curr;
            t = go(curr);
         }
         else {
            curr = father[curr];
            t = go(curr);
         }
      }
      else {
         int a = -1, b = -1;
         for(auto x : g[curr]) {
            if(x == father[curr]) continue;
            if(a == -1) a = x;
            else b = x;
         }
         
         //cerr << curr << ": " << a << ' ' << b << '\n';
         
         if(a == -1 && b == -1) return;
         if(b == -1) {
            int h = go(a);
            if(h == 1) {
               curr = a;
               t = 1;
               continue;
            }
            go(curr);
            return;
         }
         else {
            if(area[a] < area[b]) swap(a, b);
            int h = go(a);
            if(h == 1) {
               curr = a;
               t = 1;
               continue;
            }
            go(curr);
            h = go(b);
            if(h == 1) {
               curr = b;
               t = 1;
                continue;
            }
            go(curr);
            return;
         }
      }
   }
   
}

#undef N

Compilation message

interface.cpp: In function 'int main()':
interface.cpp:44:55: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   44 |     if(fread(T.data(), sizeof(int), 2 * N - 2, stdin) != 2 * N - 2) exit(0);
      |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
interface.cpp:50:33: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   50 |         int l = (numbers.size() == N ? N : 0);
      |                  ~~~~~~~~~~~~~~~^~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2824 KB Correct

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 225 ms 12804 KB Correct
2 Correct 237 ms 13184 KB Correct
3 Correct 127 ms 13856 KB Correct
4 Correct 102 ms 14764 KB Correct
5 Correct 203 ms 14372 KB Correct
6 Correct 90 ms 14712 KB Correct
7 Correct 87 ms 12960 KB Correct
8 Correct 216 ms 13336 KB Correct
9 Correct 218 ms 13860 KB Correct
10 Correct 183 ms 13200 KB Correct
11 Correct 109 ms 14664 KB Correct
12 Correct 252 ms 13380 KB Correct
13 Correct 89 ms 12864 KB Correct
14 Correct 87 ms 13352 KB Correct
15 Correct 202 ms 13960 KB Correct
16 Correct 218 ms 15124 KB Correct
17 Correct 136 ms 12172 KB Correct
18 Correct 102 ms 12940 KB Correct
19 Correct 156 ms 12188 KB Correct
20 Correct 84 ms 14464 KB Correct
21 Correct 82 ms 13212 KB Correct
22 Correct 210 ms 13212 KB Correct
23 Correct 221 ms 13448 KB Correct
24 Correct 108 ms 13016 KB Correct
25 Correct 95 ms 13940 KB Correct
26 Correct 95 ms 12824 KB Correct
27 Correct 90 ms 13240 KB Correct
28 Correct 79 ms 13700 KB Correct
29 Correct 219 ms 13756 KB Correct
30 Correct 242 ms 12572 KB Correct
31 Correct 90 ms 14460 KB Correct
32 Correct 244 ms 13628 KB Correct
33 Correct 238 ms 13780 KB Correct
34 Correct 88 ms 12676 KB Correct
35 Correct 87 ms 12424 KB Correct
36 Correct 219 ms 13556 KB Correct
37 Correct 211 ms 13636 KB Correct
38 Correct 281 ms 14396 KB Correct
39 Correct 154 ms 14784 KB Correct
40 Correct 227 ms 14016 KB Correct
41 Correct 90 ms 14232 KB Correct
42 Correct 87 ms 13780 KB Correct
43 Correct 224 ms 13632 KB Correct
44 Correct 212 ms 12192 KB Correct
45 Correct 95 ms 13096 KB Correct
46 Correct 86 ms 13116 KB Correct
47 Correct 100 ms 13888 KB Correct
48 Correct 77 ms 12448 KB Correct
49 Correct 84 ms 14220 KB Correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 75 ms 8040 KB Correct
2 Correct 84 ms 8016 KB Correct
3 Correct 79 ms 7996 KB Correct
4 Correct 82 ms 10484 KB Correct
5 Correct 133 ms 10472 KB Correct
6 Correct 154 ms 10656 KB Correct
7 Correct 74 ms 7780 KB Correct
8 Correct 77 ms 7980 KB Correct
9 Correct 71 ms 7932 KB Correct
10 Correct 73 ms 7660 KB Correct
11 Correct 69 ms 7928 KB Correct
12 Correct 77 ms 7868 KB Correct
13 Correct 79 ms 7664 KB Correct
14 Correct 54 ms 6452 KB Correct
15 Correct 56 ms 6456 KB Correct
16 Correct 73 ms 7660 KB Correct
17 Correct 76 ms 7872 KB Correct
18 Correct 72 ms 7704 KB Correct
19 Correct 72 ms 7700 KB Correct
20 Correct 51 ms 6708 KB Correct
21 Correct 53 ms 6768 KB Correct
22 Correct 57 ms 6448 KB Correct
23 Correct 60 ms 6832 KB Correct
24 Correct 47 ms 6584 KB Correct
25 Correct 57 ms 6444 KB Correct
26 Correct 79 ms 7976 KB Correct
27 Correct 76 ms 8000 KB Correct
28 Correct 71 ms 8008 KB Correct
29 Correct 82 ms 7812 KB Correct
30 Correct 83 ms 7976 KB Correct
31 Correct 82 ms 7868 KB Correct
32 Correct 79 ms 8000 KB Correct
33 Correct 70 ms 7972 KB Correct
34 Correct 75 ms 7964 KB Correct
35 Correct 80 ms 7868 KB Correct
36 Correct 70 ms 7944 KB Correct
37 Correct 83 ms 7868 KB Correct
38 Correct 76 ms 7920 KB Correct
39 Correct 72 ms 7824 KB Correct
40 Correct 76 ms 7972 KB Correct
41 Correct 78 ms 7872 KB Correct
42 Correct 86 ms 7776 KB Correct
43 Correct 79 ms 7988 KB Correct
44 Correct 82 ms 7868 KB Correct
45 Correct 72 ms 7948 KB Correct
46 Correct 81 ms 7860 KB Correct
47 Correct 71 ms 7968 KB Correct
48 Correct 76 ms 7996 KB Correct
49 Correct 80 ms 7808 KB Correct
50 Correct 70 ms 7928 KB Correct
51 Correct 81 ms 7876 KB Correct
52 Correct 79 ms 7988 KB Correct
53 Correct 76 ms 7876 KB Correct
54 Correct 76 ms 7972 KB Correct
55 Correct 78 ms 7976 KB Correct
56 Correct 77 ms 7964 KB Correct
57 Correct 63 ms 7916 KB Correct
58 Correct 81 ms 7876 KB Correct
59 Correct 73 ms 7976 KB Correct
60 Correct 74 ms 7920 KB Correct
61 Correct 73 ms 7892 KB Correct
62 Correct 76 ms 8000 KB Correct
63 Correct 75 ms 7928 KB Correct
64 Correct 70 ms 7884 KB Correct
65 Correct 71 ms 8140 KB Correct

Subtask #3
0.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2824 KB Correct
2 Correct 225 ms 12804 KB Correct
3 Correct 237 ms 13184 KB Correct
4 Correct 127 ms 13856 KB Correct
5 Correct 102 ms 14764 KB Correct
6 Correct 203 ms 14372 KB Correct
7 Correct 90 ms 14712 KB Correct
8 Correct 87 ms 12960 KB Correct
9 Correct 216 ms 13336 KB Correct
10 Correct 218 ms 13860 KB Correct
11 Correct 183 ms 13200 KB Correct
12 Correct 109 ms 14664 KB Correct
13 Correct 252 ms 13380 KB Correct
14 Correct 89 ms 12864 KB Correct
15 Correct 87 ms 13352 KB Correct
16 Correct 202 ms 13960 KB Correct
17 Correct 218 ms 15124 KB Correct
18 Correct 136 ms 12172 KB Correct
19 Correct 102 ms 12940 KB Correct
20 Correct 156 ms 12188 KB Correct
21 Correct 84 ms 14464 KB Correct
22 Correct 82 ms 13212 KB Correct
23 Correct 210 ms 13212 KB Correct
24 Correct 221 ms 13448 KB Correct
25 Correct 108 ms 13016 KB Correct
26 Correct 95 ms 13940 KB Correct
27 Correct 95 ms 12824 KB Correct
28 Correct 90 ms 13240 KB Correct
29 Correct 79 ms 13700 KB Correct
30 Correct 219 ms 13756 KB Correct
31 Correct 242 ms 12572 KB Correct
32 Correct 90 ms 14460 KB Correct
33 Correct 244 ms 13628 KB Correct
34 Correct 238 ms 13780 KB Correct
35 Correct 88 ms 12676 KB Correct
36 Correct 87 ms 12424 KB Correct
37 Correct 219 ms 13556 KB Correct
38 Correct 211 ms 13636 KB Correct
39 Correct 281 ms 14396 KB Correct
40 Correct 154 ms 14784 KB Correct
41 Correct 227 ms 14016 KB Correct
42 Correct 90 ms 14232 KB Correct
43 Correct 87 ms 13780 KB Correct
44 Correct 224 ms 13632 KB Correct
45 Correct 212 ms 12192 KB Correct
46 Correct 95 ms 13096 KB Correct
47 Correct 86 ms 13116 KB Correct
48 Correct 100 ms 13888 KB Correct
49 Correct 77 ms 12448 KB Correct
50 Correct 84 ms 14220 KB Correct
51 Correct 75 ms 8040 KB Correct
52 Correct 84 ms 8016 KB Correct
53 Correct 79 ms 7996 KB Correct
54 Correct 82 ms 10484 KB Correct
55 Correct 133 ms 10472 KB Correct
56 Correct 154 ms 10656 KB Correct
57 Correct 74 ms 7780 KB Correct
58 Correct 77 ms 7980 KB Correct
59 Correct 71 ms 7932 KB Correct
60 Correct 73 ms 7660 KB Correct
61 Correct 69 ms 7928 KB Correct
62 Correct 77 ms 7868 KB Correct
63 Correct 79 ms 7664 KB Correct
64 Correct 54 ms 6452 KB Correct
65 Correct 56 ms 6456 KB Correct
66 Correct 73 ms 7660 KB Correct
67 Correct 76 ms 7872 KB Correct
68 Correct 72 ms 7704 KB Correct
69 Correct 72 ms 7700 KB Correct
70 Correct 51 ms 6708 KB Correct
71 Correct 53 ms 6768 KB Correct
72 Correct 57 ms 6448 KB Correct
73 Correct 60 ms 6832 KB Correct
74 Correct 47 ms 6584 KB Correct
75 Correct 57 ms 6444 KB Correct
76 Correct 79 ms 7976 KB Correct
77 Correct 76 ms 8000 KB Correct
78 Correct 71 ms 8008 KB Correct
79 Correct 82 ms 7812 KB Correct
80 Correct 83 ms 7976 KB Correct
81 Correct 82 ms 7868 KB Correct
82 Correct 79 ms 8000 KB Correct
83 Correct 70 ms 7972 KB Correct
84 Correct 75 ms 7964 KB Correct
85 Correct 80 ms 7868 KB Correct
86 Correct 70 ms 7944 KB Correct
87 Correct 83 ms 7868 KB Correct
88 Correct 76 ms 7920 KB Correct
89 Correct 72 ms 7824 KB Correct
90 Correct 76 ms 7972 KB Correct
91 Correct 78 ms 7872 KB Correct
92 Correct 86 ms 7776 KB Correct
93 Correct 79 ms 7988 KB Correct
94 Correct 82 ms 7868 KB Correct
95 Correct 72 ms 7948 KB Correct
96 Correct 81 ms 7860 KB Correct
97 Correct 71 ms 7968 KB Correct
98 Correct 76 ms 7996 KB Correct
99 Correct 80 ms 7808 KB Correct
100 Correct 70 ms 7928 KB Correct
101 Correct 81 ms 7876 KB Correct
102 Correct 79 ms 7988 KB Correct
103 Correct 76 ms 7876 KB Correct
104 Correct 76 ms 7972 KB Correct
105 Correct 78 ms 7976 KB Correct
106 Correct 77 ms 7964 KB Correct
107 Correct 63 ms 7916 KB Correct
108 Correct 81 ms 7876 KB Correct
109 Correct 73 ms 7976 KB Correct
110 Correct 74 ms 7920 KB Correct
111 Correct 73 ms 7892 KB Correct
112 Correct 76 ms 8000 KB Correct
113 Correct 75 ms 7928 KB Correct
114 Correct 70 ms 7884 KB Correct
115 Correct 71 ms 8140 KB Correct
116 Correct 95 ms 8648 KB Correct
117 Incorrect 88 ms 8488 KB Not correct
118 Halted 0 ms 0 KB -