oj.uz

Submission #169040

# Submission time Handle Problem Language Result Execution time Memory
169040 2019-12-18T04:51:12 Z AlexLuchianov Race (IOI11_race) C++14
100 / 100
 687 ms 34040 KB 
#include "race.h"
#include <vector>
#include <iostream>
#include <algorithm>

using ll = long long;

#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define MAX(a, b) (((a) < (b)) ? (b) : (a))

int const nmax = 200000;
int const kmax = 1000000;

struct Edge{
  int to;
  int cost;
};
std::vector<Edge> g[1 + nmax];

int sz[1 + nmax], seen[1 + nmax];

void dfs(int node, int parent){
  sz[node] = 1;
  for(int h = 0; h < g[node].size(); h++){
    Edge e = g[node][h];
    if(seen[e.to] == 0 && e.to != parent){
      dfs(e.to, node);
      sz[node] += sz[e.to];
    }
  }
}
 int find_centroid(int node, int parent, int target){
  for(int h = 0; h < g[node].size(); h++){
    Edge e = g[node][h];
    if(e.to != parent && seen[e.to] == 0 && target < sz[e.to])
      return find_centroid(e.to, node, target);
  }
  return node;
}

int dp[1 + kmax];

int stepsadd = 0, stepsdelete = 0, stepsquery = 0;

void addnode(int node, int parent, int acc, int level, int &k){
  if(acc <= k) {
    stepsadd++;
    if(level < dp[acc])
      dp[acc] = level;

    for(int h = 0; h < g[node].size(); h++){
      Edge e = g[node][h];
      if(e.to != parent && seen[e.to] == 0)
        addnode(e.to, node, acc + e.cost, level + 1, k);
    }
  }
}

void deletenode(int node, int parent, int acc, int level, int &k){
  if(acc <= k) {
    stepsdelete++;
    dp[acc] = nmax;
    for(int h = 0; h < g[node].size(); h++){
      Edge e = g[node][h];
      if(e.to != parent && seen[e.to] == 0)
        deletenode(e.to, node, acc + e.cost, level + 1, k);
    }
  }
}

void querynode(int node, int parent, int acc, int level, int &result, int &k){
  if(acc <= k) {
    stepsquery++;
    if(dp[k - acc] + level < result)
      result = dp[k - acc] + level;
    for(int h = 0; h < g[node].size(); h++){
      Edge e = g[node][h];
      if(e.to != parent && seen[e.to] == 0)
        querynode(e.to, node, acc + e.cost, level + 1, result, k);
    }
  }
}

void solve(int node, int &result, int &k){
  dp[0] = 0;

  dfs(node, -1);
  int centroid = find_centroid(node, -1, sz[node] / 2);

  for(int h = 0; h < g[centroid].size(); h++){
    Edge e = g[centroid][h];
    if(seen[e.to] == 0) {
      querynode(e.to, centroid, e.cost, 1, result, k);
      addnode(e.to, centroid, e.cost, 1, k);
    }
  }

  deletenode(centroid, -1, 0, 0, k);

  seen[centroid] = 1;
  for(int h = 0; h < g[centroid].size(); h++){
    Edge e = g[centroid][h];
    if(seen[e.to] == 0)
      solve(e.to, result, k);
  }
}

int best_path(int N, int K, int H[][2], int L[])
{
  for(int i = 0; i <= K; i++)
    dp[i] = nmax;


  for(int i = 0; i < N - 1; i++){
    int x = H[i][0], y = H[i][1];
    g[x].push_back({y, L[i]});
    g[y].push_back({x, L[i]});
  }
  int result = nmax, result2 = 0;

  solve(0, result, K);
  if(result < nmax)
    return result;
  else
    return -1;
}

Compilation message

race.cpp: In function 'void dfs(int, int)':
race.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int h = 0; h < g[node].size(); h++){
                  ~~^~~~~~~~~~~~~~~~
race.cpp: In function 'int find_centroid(int, int, int)':
race.cpp:33:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int h = 0; h < g[node].size(); h++){
                  ~~^~~~~~~~~~~~~~~~
race.cpp: In function 'void addnode(int, int, int, int, int&)':
race.cpp:51:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int h = 0; h < g[node].size(); h++){
                    ~~^~~~~~~~~~~~~~~~
race.cpp: In function 'void deletenode(int, int, int, int, int&)':
race.cpp:63:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int h = 0; h < g[node].size(); h++){
                    ~~^~~~~~~~~~~~~~~~
race.cpp: In function 'void querynode(int, int, int, int, int&, int&)':
race.cpp:76:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int h = 0; h < g[node].size(); h++){
                    ~~^~~~~~~~~~~~~~~~
race.cpp: In function 'void solve(int, int&, int&)':
race.cpp:90:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int h = 0; h < g[centroid].size(); h++){
                  ~~^~~~~~~~~~~~~~~~~~~~
race.cpp:101:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int h = 0; h < g[centroid].size(); h++){
                  ~~^~~~~~~~~~~~~~~~~~~~
race.cpp: In function 'int best_path(int, int, int (*)[2], int*)':
race.cpp:119:22: warning: unused variable 'result2' [-Wunused-variable]
   int result = nmax, result2 = 0;
                      ^~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4984 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 6 ms 5112 KB Output is correct
4 Correct 6 ms 4984 KB Output is correct
5 Correct 6 ms 4984 KB Output is correct
6 Correct 6 ms 5112 KB Output is correct
7 Correct 7 ms 4984 KB Output is correct
8 Correct 6 ms 5112 KB Output is correct
9 Correct 6 ms 5112 KB Output is correct
10 Correct 6 ms 5112 KB Output is correct
11 Correct 6 ms 5112 KB Output is correct
12 Correct 6 ms 5112 KB Output is correct
13 Correct 6 ms 4984 KB Output is correct
14 Correct 7 ms 5112 KB Output is correct
15 Correct 6 ms 5032 KB Output is correct
16 Correct 6 ms 5112 KB Output is correct
17 Correct 6 ms 5112 KB Output is correct
18 Correct 6 ms 5112 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4984 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 6 ms 5112 KB Output is correct
4 Correct 6 ms 4984 KB Output is correct
5 Correct 6 ms 4984 KB Output is correct
6 Correct 6 ms 5112 KB Output is correct
7 Correct 7 ms 4984 KB Output is correct
8 Correct 6 ms 5112 KB Output is correct
9 Correct 6 ms 5112 KB Output is correct
10 Correct 6 ms 5112 KB Output is correct
11 Correct 6 ms 5112 KB Output is correct
12 Correct 6 ms 5112 KB Output is correct
13 Correct 6 ms 4984 KB Output is correct
14 Correct 7 ms 5112 KB Output is correct
15 Correct 6 ms 5032 KB Output is correct
16 Correct 6 ms 5112 KB Output is correct
17 Correct 6 ms 5112 KB Output is correct
18 Correct 6 ms 5112 KB Output is correct
19 Correct 6 ms 4984 KB Output is correct
20 Correct 6 ms 4984 KB Output is correct
21 Correct 7 ms 5112 KB Output is correct
22 Correct 10 ms 8668 KB Output is correct
23 Correct 9 ms 8056 KB Output is correct
24 Correct 9 ms 8440 KB Output is correct
25 Correct 10 ms 8440 KB Output is correct
26 Correct 8 ms 6520 KB Output is correct
27 Correct 9 ms 8312 KB Output is correct
28 Correct 8 ms 5880 KB Output is correct
29 Correct 8 ms 6392 KB Output is correct
30 Correct 9 ms 6520 KB Output is correct
31 Correct 9 ms 7672 KB Output is correct
32 Correct 9 ms 7928 KB Output is correct
33 Correct 10 ms 8316 KB Output is correct
34 Correct 9 ms 7416 KB Output is correct
35 Correct 9 ms 8312 KB Output is correct
36 Correct 10 ms 8824 KB Output is correct
37 Correct 11 ms 8176 KB Output is correct
38 Correct 12 ms 7160 KB Output is correct

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4984 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 6 ms 5112 KB Output is correct
4 Correct 6 ms 4984 KB Output is correct
5 Correct 6 ms 4984 KB Output is correct
6 Correct 6 ms 5112 KB Output is correct
7 Correct 7 ms 4984 KB Output is correct
8 Correct 6 ms 5112 KB Output is correct
9 Correct 6 ms 5112 KB Output is correct
10 Correct 6 ms 5112 KB Output is correct
11 Correct 6 ms 5112 KB Output is correct
12 Correct 6 ms 5112 KB Output is correct
13 Correct 6 ms 4984 KB Output is correct
14 Correct 7 ms 5112 KB Output is correct
15 Correct 6 ms 5032 KB Output is correct
16 Correct 6 ms 5112 KB Output is correct
17 Correct 6 ms 5112 KB Output is correct
18 Correct 6 ms 5112 KB Output is correct
19 Correct 181 ms 12152 KB Output is correct
20 Correct 177 ms 11940 KB Output is correct
21 Correct 245 ms 11960 KB Output is correct
22 Correct 203 ms 12220 KB Output is correct
23 Correct 142 ms 12280 KB Output is correct
24 Correct 84 ms 12280 KB Output is correct
25 Correct 201 ms 14940 KB Output is correct
26 Correct 142 ms 17784 KB Output is correct
27 Correct 208 ms 19348 KB Output is correct
28 Correct 350 ms 30968 KB Output is correct
29 Correct 324 ms 29816 KB Output is correct
30 Correct 199 ms 19468 KB Output is correct
31 Correct 209 ms 19448 KB Output is correct
32 Correct 241 ms 19452 KB Output is correct
33 Correct 298 ms 18168 KB Output is correct
34 Correct 241 ms 19064 KB Output is correct

Subtask #4
57.0 / 57.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4984 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 6 ms 5112 KB Output is correct
4 Correct 6 ms 4984 KB Output is correct
5 Correct 6 ms 4984 KB Output is correct
6 Correct 6 ms 5112 KB Output is correct
7 Correct 7 ms 4984 KB Output is correct
8 Correct 6 ms 5112 KB Output is correct
9 Correct 6 ms 5112 KB Output is correct
10 Correct 6 ms 5112 KB Output is correct
11 Correct 6 ms 5112 KB Output is correct
12 Correct 6 ms 5112 KB Output is correct
13 Correct 6 ms 4984 KB Output is correct
14 Correct 7 ms 5112 KB Output is correct
15 Correct 6 ms 5032 KB Output is correct
16 Correct 6 ms 5112 KB Output is correct
17 Correct 6 ms 5112 KB Output is correct
18 Correct 6 ms 5112 KB Output is correct
19 Correct 6 ms 4984 KB Output is correct
20 Correct 6 ms 4984 KB Output is correct
21 Correct 7 ms 5112 KB Output is correct
22 Correct 10 ms 8668 KB Output is correct
23 Correct 9 ms 8056 KB Output is correct
24 Correct 9 ms 8440 KB Output is correct
25 Correct 10 ms 8440 KB Output is correct
26 Correct 8 ms 6520 KB Output is correct
27 Correct 9 ms 8312 KB Output is correct
28 Correct 8 ms 5880 KB Output is correct
29 Correct 8 ms 6392 KB Output is correct
30 Correct 9 ms 6520 KB Output is correct
31 Correct 9 ms 7672 KB Output is correct
32 Correct 9 ms 7928 KB Output is correct
33 Correct 10 ms 8316 KB Output is correct
34 Correct 9 ms 7416 KB Output is correct
35 Correct 9 ms 8312 KB Output is correct
36 Correct 10 ms 8824 KB Output is correct
37 Correct 11 ms 8176 KB Output is correct
38 Correct 12 ms 7160 KB Output is correct
39 Correct 181 ms 12152 KB Output is correct
40 Correct 177 ms 11940 KB Output is correct
41 Correct 245 ms 11960 KB Output is correct
42 Correct 203 ms 12220 KB Output is correct
43 Correct 142 ms 12280 KB Output is correct
44 Correct 84 ms 12280 KB Output is correct
45 Correct 201 ms 14940 KB Output is correct
46 Correct 142 ms 17784 KB Output is correct
47 Correct 208 ms 19348 KB Output is correct
48 Correct 350 ms 30968 KB Output is correct
49 Correct 324 ms 29816 KB Output is correct
50 Correct 199 ms 19468 KB Output is correct
51 Correct 209 ms 19448 KB Output is correct
52 Correct 241 ms 19452 KB Output is correct
53 Correct 298 ms 18168 KB Output is correct
54 Correct 241 ms 19064 KB Output is correct
55 Correct 18 ms 5752 KB Output is correct
56 Correct 20 ms 5752 KB Output is correct
57 Correct 114 ms 12252 KB Output is correct
58 Correct 48 ms 12012 KB Output is correct
59 Correct 148 ms 18528 KB Output is correct
60 Correct 606 ms 34040 KB Output is correct
61 Correct 250 ms 19676 KB Output is correct
62 Correct 256 ms 23516 KB Output is correct
63 Correct 332 ms 23544 KB Output is correct
64 Correct 687 ms 21812 KB Output is correct
65 Correct 261 ms 20344 KB Output is correct
66 Correct 524 ms 31992 KB Output is correct
67 Correct 134 ms 24040 KB Output is correct
68 Correct 316 ms 24056 KB Output is correct
69 Correct 311 ms 24312 KB Output is correct
70 Correct 303 ms 23800 KB Output is correct