Submission #102845

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
102845	2019-03-28 01:01:42	wxh010910	Highway Tolls (IOI18_highway)	C++17	100 / 100	347 ms	11068 KiB

highway

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#include <bits/stdc++.h>
#include "highway.h"
using namespace std;
void find_pair(int n, vector<int> u, vector<int> v, int a, int b) {
  vector<vector<pair<int, int>>> adj(n);
  int m = u.size();
  vector<int> w(m);
  for (int i = 0; i < m; ++i) {
    adj[u[i]].emplace_back(v[i], i);
    adj[v[i]].emplace_back(u[i], i);
  }
  long long value = ask(w);
  int l = 0, r = m - 2, e = m - 1;
  while (l <= r) {
    int mid = l + r >> 1;
    for (int i = 0; i < m; ++i) {
      w[i] = i <= mid;
    }
    if (ask(w) != value) {
      e = mid;
      r = mid - 1;
    } else {
      l = mid + 1;
    }
  }
  vector<int> tree, left, right, visit(n);
  queue<int> q;
  q.push(u[e]);
 
 
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Compilation message (stderr)

highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:17:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = l + r >> 1;
               ~~^~~
highway.cpp: In lambda function:
highway.cpp:59:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
       int mid = l + r >> 1;
                 ~~^~~
highway.cpp:61:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for (int i = mid + 1; i < nodes.size(); ++i) {
                             ~~^~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 6 / 6
• Subtask 4: 33 / 33
• Subtask 5: 18 / 18
• Subtask 6: 31 / 31