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Submission #1073084

# Submission time Handle Problem Language Result Execution time Memory
1073084 2024-08-24T09:21:01 Z cadmiumsky The Ties That Guide Us (CEOI23_incursion) C++17
60 / 100
 297 ms 15164 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) {
   //cerr << node << ' ' << area[node] << '\n';
   for(auto x : g[node]) {
      if(x == f) continue;
      //cerr << '\t' << x << ' ' << area[x] << '\n';
      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_; }
   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 2820 KB Correct

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 224 ms 12944 KB Correct
2 Correct 221 ms 13080 KB Correct
3 Correct 125 ms 14116 KB Correct
4 Correct 97 ms 14700 KB Correct
5 Correct 203 ms 14372 KB Correct
6 Correct 90 ms 14608 KB Correct
7 Correct 83 ms 12968 KB Correct
8 Correct 201 ms 13296 KB Correct
9 Correct 233 ms 13724 KB Correct
10 Correct 163 ms 13136 KB Correct
11 Correct 110 ms 14940 KB Correct
12 Correct 297 ms 13344 KB Correct
13 Correct 83 ms 12836 KB Correct
14 Correct 83 ms 13368 KB Correct
15 Correct 230 ms 13904 KB Correct
16 Correct 234 ms 15164 KB Correct
17 Correct 123 ms 12188 KB Correct
18 Correct 105 ms 13072 KB Correct
19 Correct 159 ms 12156 KB Correct
20 Correct 86 ms 14392 KB Correct
21 Correct 89 ms 13304 KB Correct
22 Correct 225 ms 13372 KB Correct
23 Correct 214 ms 13484 KB Correct
24 Correct 98 ms 13196 KB Correct
25 Correct 91 ms 13980 KB Correct
26 Correct 88 ms 12612 KB Correct
27 Correct 82 ms 13176 KB Correct
28 Correct 82 ms 13688 KB Correct
29 Correct 217 ms 13612 KB Correct
30 Correct 217 ms 12800 KB Correct
31 Correct 93 ms 14472 KB Correct
32 Correct 218 ms 13460 KB Correct
33 Correct 245 ms 13788 KB Correct
34 Correct 83 ms 12704 KB Correct
35 Correct 78 ms 12412 KB Correct
36 Correct 224 ms 13732 KB Correct
37 Correct 198 ms 13592 KB Correct
38 Correct 243 ms 14500 KB Correct
39 Correct 147 ms 14636 KB Correct
40 Correct 181 ms 14148 KB Correct
41 Correct 84 ms 14096 KB Correct
42 Correct 86 ms 13700 KB Correct
43 Correct 219 ms 13608 KB Correct
44 Correct 202 ms 12240 KB Correct
45 Correct 97 ms 13056 KB Correct
46 Correct 86 ms 13124 KB Correct
47 Correct 93 ms 13848 KB Correct
48 Correct 83 ms 12412 KB Correct
49 Correct 75 ms 14208 KB Correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 74 ms 7948 KB Correct
2 Correct 71 ms 7980 KB Correct
3 Correct 77 ms 8004 KB Correct
4 Correct 83 ms 10468 KB Correct
5 Correct 137 ms 10592 KB Correct
6 Correct 170 ms 10480 KB Correct
7 Correct 75 ms 7916 KB Correct
8 Correct 74 ms 7700 KB Correct
9 Correct 74 ms 7916 KB Correct
10 Correct 71 ms 8076 KB Correct
11 Correct 76 ms 7964 KB Correct
12 Correct 77 ms 7656 KB Correct
13 Correct 76 ms 7888 KB Correct
14 Correct 60 ms 6464 KB Correct
15 Correct 56 ms 6456 KB Correct
16 Correct 74 ms 7716 KB Correct
17 Correct 82 ms 7760 KB Correct
18 Correct 72 ms 7716 KB Correct
19 Correct 75 ms 7980 KB Correct
20 Correct 52 ms 6472 KB Correct
21 Correct 54 ms 6564 KB Correct
22 Correct 52 ms 6576 KB Correct
23 Correct 60 ms 6308 KB Correct
24 Correct 56 ms 6700 KB Correct
25 Correct 51 ms 6448 KB Correct
26 Correct 81 ms 7960 KB Correct
27 Correct 78 ms 7908 KB Correct
28 Correct 74 ms 7976 KB Correct
29 Correct 84 ms 7844 KB Correct
30 Correct 79 ms 7972 KB Correct
31 Correct 79 ms 7960 KB Correct
32 Correct 79 ms 7948 KB Correct
33 Correct 80 ms 7940 KB Correct
34 Correct 76 ms 7996 KB Correct
35 Correct 68 ms 7940 KB Correct
36 Correct 89 ms 7976 KB Correct
37 Correct 78 ms 7868 KB Correct
38 Correct 79 ms 7896 KB Correct
39 Correct 76 ms 8004 KB Correct
40 Correct 78 ms 7984 KB Correct
41 Correct 75 ms 8012 KB Correct
42 Correct 68 ms 7912 KB Correct
43 Correct 74 ms 7996 KB Correct
44 Correct 76 ms 7976 KB Correct
45 Correct 77 ms 7912 KB Correct
46 Correct 77 ms 7936 KB Correct
47 Correct 81 ms 7972 KB Correct
48 Correct 74 ms 8000 KB Correct
49 Correct 76 ms 7980 KB Correct
50 Correct 75 ms 8004 KB Correct
51 Correct 75 ms 7912 KB Correct
52 Correct 77 ms 7984 KB Correct
53 Correct 77 ms 7972 KB Correct
54 Correct 81 ms 8048 KB Correct
55 Correct 74 ms 8008 KB Correct
56 Correct 75 ms 7908 KB Correct
57 Correct 74 ms 7828 KB Correct
58 Correct 74 ms 7908 KB Correct
59 Correct 80 ms 8120 KB Correct
60 Correct 78 ms 7844 KB Correct
61 Correct 82 ms 7980 KB Correct
62 Correct 75 ms 7972 KB Correct
63 Correct 75 ms 8000 KB Correct
64 Correct 73 ms 7960 KB Correct
65 Correct 79 ms 7972 KB Correct

Subtask #3
0.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2820 KB Correct
2 Correct 224 ms 12944 KB Correct
3 Correct 221 ms 13080 KB Correct
4 Correct 125 ms 14116 KB Correct
5 Correct 97 ms 14700 KB Correct
6 Correct 203 ms 14372 KB Correct
7 Correct 90 ms 14608 KB Correct
8 Correct 83 ms 12968 KB Correct
9 Correct 201 ms 13296 KB Correct
10 Correct 233 ms 13724 KB Correct
11 Correct 163 ms 13136 KB Correct
12 Correct 110 ms 14940 KB Correct
13 Correct 297 ms 13344 KB Correct
14 Correct 83 ms 12836 KB Correct
15 Correct 83 ms 13368 KB Correct
16 Correct 230 ms 13904 KB Correct
17 Correct 234 ms 15164 KB Correct
18 Correct 123 ms 12188 KB Correct
19 Correct 105 ms 13072 KB Correct
20 Correct 159 ms 12156 KB Correct
21 Correct 86 ms 14392 KB Correct
22 Correct 89 ms 13304 KB Correct
23 Correct 225 ms 13372 KB Correct
24 Correct 214 ms 13484 KB Correct
25 Correct 98 ms 13196 KB Correct
26 Correct 91 ms 13980 KB Correct
27 Correct 88 ms 12612 KB Correct
28 Correct 82 ms 13176 KB Correct
29 Correct 82 ms 13688 KB Correct
30 Correct 217 ms 13612 KB Correct
31 Correct 217 ms 12800 KB Correct
32 Correct 93 ms 14472 KB Correct
33 Correct 218 ms 13460 KB Correct
34 Correct 245 ms 13788 KB Correct
35 Correct 83 ms 12704 KB Correct
36 Correct 78 ms 12412 KB Correct
37 Correct 224 ms 13732 KB Correct
38 Correct 198 ms 13592 KB Correct
39 Correct 243 ms 14500 KB Correct
40 Correct 147 ms 14636 KB Correct
41 Correct 181 ms 14148 KB Correct
42 Correct 84 ms 14096 KB Correct
43 Correct 86 ms 13700 KB Correct
44 Correct 219 ms 13608 KB Correct
45 Correct 202 ms 12240 KB Correct
46 Correct 97 ms 13056 KB Correct
47 Correct 86 ms 13124 KB Correct
48 Correct 93 ms 13848 KB Correct
49 Correct 83 ms 12412 KB Correct
50 Correct 75 ms 14208 KB Correct
51 Correct 74 ms 7948 KB Correct
52 Correct 71 ms 7980 KB Correct
53 Correct 77 ms 8004 KB Correct
54 Correct 83 ms 10468 KB Correct
55 Correct 137 ms 10592 KB Correct
56 Correct 170 ms 10480 KB Correct
57 Correct 75 ms 7916 KB Correct
58 Correct 74 ms 7700 KB Correct
59 Correct 74 ms 7916 KB Correct
60 Correct 71 ms 8076 KB Correct
61 Correct 76 ms 7964 KB Correct
62 Correct 77 ms 7656 KB Correct
63 Correct 76 ms 7888 KB Correct
64 Correct 60 ms 6464 KB Correct
65 Correct 56 ms 6456 KB Correct
66 Correct 74 ms 7716 KB Correct
67 Correct 82 ms 7760 KB Correct
68 Correct 72 ms 7716 KB Correct
69 Correct 75 ms 7980 KB Correct
70 Correct 52 ms 6472 KB Correct
71 Correct 54 ms 6564 KB Correct
72 Correct 52 ms 6576 KB Correct
73 Correct 60 ms 6308 KB Correct
74 Correct 56 ms 6700 KB Correct
75 Correct 51 ms 6448 KB Correct
76 Correct 81 ms 7960 KB Correct
77 Correct 78 ms 7908 KB Correct
78 Correct 74 ms 7976 KB Correct
79 Correct 84 ms 7844 KB Correct
80 Correct 79 ms 7972 KB Correct
81 Correct 79 ms 7960 KB Correct
82 Correct 79 ms 7948 KB Correct
83 Correct 80 ms 7940 KB Correct
84 Correct 76 ms 7996 KB Correct
85 Correct 68 ms 7940 KB Correct
86 Correct 89 ms 7976 KB Correct
87 Correct 78 ms 7868 KB Correct
88 Correct 79 ms 7896 KB Correct
89 Correct 76 ms 8004 KB Correct
90 Correct 78 ms 7984 KB Correct
91 Correct 75 ms 8012 KB Correct
92 Correct 68 ms 7912 KB Correct
93 Correct 74 ms 7996 KB Correct
94 Correct 76 ms 7976 KB Correct
95 Correct 77 ms 7912 KB Correct
96 Correct 77 ms 7936 KB Correct
97 Correct 81 ms 7972 KB Correct
98 Correct 74 ms 8000 KB Correct
99 Correct 76 ms 7980 KB Correct
100 Correct 75 ms 8004 KB Correct
101 Correct 75 ms 7912 KB Correct
102 Correct 77 ms 7984 KB Correct
103 Correct 77 ms 7972 KB Correct
104 Correct 81 ms 8048 KB Correct
105 Correct 74 ms 8008 KB Correct
106 Correct 75 ms 7908 KB Correct
107 Correct 74 ms 7828 KB Correct
108 Correct 74 ms 7908 KB Correct
109 Correct 80 ms 8120 KB Correct
110 Correct 78 ms 7844 KB Correct
111 Correct 82 ms 7980 KB Correct
112 Correct 75 ms 7972 KB Correct
113 Correct 75 ms 8000 KB Correct
114 Correct 73 ms 7960 KB Correct
115 Correct 79 ms 7972 KB Correct
116 Correct 88 ms 8496 KB Correct
117 Incorrect 83 ms 8472 KB Not correct
118 Halted 0 ms 0 KB -