Submission #284340

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
284340	2020-08-27 08:58:43	AlexLuchianov	Railway (BOI17_railway)	C++14	100 / 100	297 ms	25076 KiB

railway

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#include <iostream>
#include <vector>
#include <cassert>
#include <cmath>
#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 = 100000;
int const lgmax = 20;
std::vector<std::pair<int,int>> g[1 + nmax];
int ord[1 + nmax], ptr = 0;
int level[1 + nmax];
int far[1 + lgmax][1 + nmax];
void computefar(int n) {
  for(int h = 1; h <= lgmax; h++)
    for(int i = 1;i <= n; i++)
      far[h][i] = far[h - 1][far[h - 1][i]];
}
int getlca(int x, int y) {
  if(level[x] < level[y])
    std::swap(x, y);
  for(int h = lgmax; 0 <= h; h--)
    if(level[y] + (1 << h) <= level[x])
      x = far[h][x];
 
 
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Compilation message (stderr)

railway.cpp: In function 'void dfs(int, int)':
railway.cpp:49:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |   for(int h = 0; h < g[node].size(); h++) {
      |                  ~~^~~~~~~~~~~~~~~~
railway.cpp: In function 'void refresh(int, int)':
railway.cpp:71:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |   for(int h = 0; h < g[node].size(); h++) {
      |                  ~~^~~~~~~~~~~~~~~~
railway.cpp: In function 'int main()':
railway.cpp:102:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  102 |     for(int i = 0; i < aux.size(); i++)
      |                    ~~^~~~~~~~~~~~
railway.cpp:113:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  113 |   for(int i = 0; i < sol.size(); i++)
      |                  ~~^~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 15 / 15
• Subtask 3: 7 / 7
• Subtask 4: 29 / 29
• Subtask 5: 16 / 16
• Subtask 6: 25 / 25