oj.uz

Submission #1109845

# Submission time Handle Problem Language Result Execution time Memory
1109845 2024-11-07T19:39:09 Z SonicML Dreaming (IOI13_dreaming) C++14
18 / 100
 37 ms 13136 KB 
#include "dreaming.h"
#include <vector>
#include <iostream>

using namespace std;

struct Edge{
  int to;
  int cost;
};

int const NMAX = 1e5;
vector <Edge> g[1 + NMAX];
int below[1 + NMAX];
int above[1 + NMAX];
int visit[1 + NMAX];

void computeBelow(int node, int parent) {
  visit[node] = true;
  for(int i = 0;i < g[node].size();i++) {
    int to = g[node][i].to, cost = g[node][i].cost;
    if(to != parent) {
      computeBelow(to, node);
      below[node] = max(below[node], below[to] + cost);
    }
  }
}

int computeAbove(int node, int parent) {
  int ans = max(above[node], below[node]);
  //cerr << node << ' ' << above[node] << ' ' << below[node] << '\n';
  visit[node] = true;
  int best1 = above[node], best2 = 0;
  for(int i = 0;i < g[node].size();i++) {
    int to = g[node][i].to, cost = g[node][i].cost;
    if(to != parent) {
      if(best1 < below[to] + cost) {
	best2 = best1;
	best1 = below[to] + cost;
      }else if(best2 < below[to] + cost) {
	best2 = below[to] + cost;
      }
    } 
  } 
  for(int i = 0;i < g[node].size();i++) {
    int to = g[node][i].to, cost = g[node][i].cost;
    if(to != parent) {
      if(below[to] + cost == best1) {
        above[to] = best2 + cost;
      }else {
	above[to] = best1 + cost;
      }
      ans = min(ans, computeAbove(to, node));
    }
  }
  return ans;
}

int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
  
  for(int i = 0;i < M;i++) {
    g[A[i]].push_back({B[i], T[i]});
    g[B[i]].push_back({A[i], T[i]});
  }
  for(int i = 0;i < N;i++) {
    if(!visit[i]) {
      computeBelow(i, i);
    }
  }
  for(int i = 0;i < N;i++) {
    visit[i] = 0;
  }
  vector <int> len;
  int core = 0;
  for(int i = 0;i < N;i++) {
    if(!visit[i]) {
      int temp = computeAbove(i, i);
      //cerr << temp << '\n';
      len.push_back(temp);
      if(len[core] < temp) {
        core = len.size()-1;
      }
    }
  }
  //cerr << '\n';
  int best1 = 0, best2 = 0;
  for(int i = 0;i < len.size();i++) { 
    int temp;
    if(i == core) {
      temp = len[i]; 
    }else {
      temp = len[i] + L; 
    }
    if(best1 < temp) {
      best2 = best1;
      best1 = temp;
    }else if(best2 < temp) {
      best2 = temp;
    }
  }
  return best1 + best2;
}

Compilation message

dreaming.cpp: In function 'void computeBelow(int, int)':
dreaming.cpp:20:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |   for(int i = 0;i < g[node].size();i++) {
      |                 ~~^~~~~~~~~~~~~~~~
dreaming.cpp: In function 'int computeAbove(int, int)':
dreaming.cpp:34:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |   for(int i = 0;i < g[node].size();i++) {
      |                 ~~^~~~~~~~~~~~~~~~
dreaming.cpp:45:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |   for(int i = 0;i < g[node].size();i++) {
      |                 ~~^~~~~~~~~~~~~~~~
dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:87:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   87 |   for(int i = 0;i < len.size();i++) {
      |                 ~~^~~~~~~~~~~~

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 37 ms 13136 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 4944 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 37 ms 13136 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 8016 KB Output is correct
2 Correct 12 ms 7760 KB Output is correct
3 Correct 13 ms 8016 KB Output is correct
4 Correct 13 ms 7760 KB Output is correct
5 Correct 13 ms 7720 KB Output is correct
6 Correct 13 ms 8164 KB Output is correct
7 Correct 13 ms 7892 KB Output is correct
8 Correct 12 ms 7752 KB Output is correct
9 Correct 16 ms 7760 KB Output is correct
10 Correct 15 ms 7884 KB Output is correct
11 Correct 1 ms 5112 KB Output is correct
12 Correct 3 ms 5580 KB Output is correct
13 Correct 3 ms 5580 KB Output is correct
14 Correct 3 ms 5616 KB Output is correct
15 Correct 3 ms 5580 KB Output is correct
16 Correct 3 ms 5580 KB Output is correct
17 Correct 4 ms 5580 KB Output is correct
18 Correct 3 ms 5580 KB Output is correct
19 Correct 3 ms 5580 KB Output is correct
20 Correct 1 ms 2896 KB Output is correct
21 Correct 1 ms 2896 KB Output is correct
22 Correct 1 ms 4944 KB Output is correct
23 Correct 4 ms 5580 KB Output is correct

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 4944 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 37 ms 13136 KB Output isn't correct
2 Halted 0 ms 0 KB -