Submission #119520

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
119520	2019-06-21 10:50:15	PeppaPig	Towns (IOI15_towns)	C++14	100 / 100	25 ms	664 KiB

towns

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#include "towns.h"
#include <bits/stdc++.h>
using namespace std;
const int N = 205;
int hubDistance(int n, int sub) {
  vector<vector<int> > d(N, vector<int>(N, 0));
  auto get_dist = [&](int a, int b) {
    if(a == b) return 0;
    else if(d[a][b]) return d[a][b];
    else return d[a][b] = d[b][a] = getDistance(a, b);
  };  
  int a, b;
  for(int i = 0, mx = -1; i < n; i++) if(get_dist(0, i) > mx) a = i, mx = get_dist(0, i);
  for(int i = 0, mx = -1; i < n; i++) if(get_dist(a, i) > mx) b = i, mx = get_dist(a, i);
  int root1 = -1, root2 = -1, ans = INT_MAX;
  for(int i = 0; i < n; i++) {
    int pos = (get_dist(a, i) + get_dist(a, 0) - get_dist(i, 0)) / 2;
    int now = max(pos, get_dist(a, b) - pos);
    if(now <= ans) {
      if(now < ans) root1 = pos, root2 = -1;
      else {
        if(root1 == -1) root1 = pos;
        else if(pos != root1) root2 = pos;
      }
      ans = now;
 
 
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Compilation message (stderr)

towns.cpp: In lambda function:
towns.cpp:51:7: warning: declaration of 'd' shadows a previous local [-Wshadow]
   int d = get_dist(a, x) + get_dist(0, y) - get_dist(a, 0);
       ^
towns.cpp:9:23: note: shadowed declaration is here
  vector<vector<int> > d(N, vector<int>(N, 0));
                       ^
towns.cpp: In lambda function:
towns.cpp:63:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i = 0; i < v.size(); i++) {
                  ~~^~~~~~~~~~
towns.cpp:70:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i = 0; i < v.size(); i++) {
                  ~~^~~~~~~~~~
towns.cpp: In function 'int hubDistance(int, int)':
towns.cpp:8:28: warning: unused parameter 'sub' [-Wunused-parameter]
 int hubDistance(int n, int sub) {
                            ^~~
towns.cpp:11:3: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(a == b) return 0;
   ^~

• Subtask 1: 13 / 13
• Subtask 2: 12 / 12
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 13 / 13
• Subtask 6: 39 / 39