Submission #825716

#	Time	Username	Problem	Language	Result	Execution time	Memory
825716		top34051	Thousands Islands (IOI22_islands)	C++17	5 / 100	24 ms	4412 KiB

islands

#include "islands.h"

#include <variant>
#include <vector>

std::variant<bool, std::vector<int>> find_journey(int N, int M,
                                                  std::vector<int> U,
                                                  std::vector<int> V) {
  // Subtask 1
  if (N == 2) {
    std::vector<int> way, yaw;
    for (int i = 0; i < M; ++i) {
      int u = U[i], v = V[i];
      if (u == 0) {
        way.push_back(i);
      } else {
        yaw.push_back(i);
      }
    }
    if ((int)way.size() >= 2 && (int)yaw.size() >= 1) {
      return std::vector({way[0], yaw[0], way[1], way[0], yaw[0], way[1]});
    }
  }
  return false;
}

Compilation message (stderr)

islands.cpp: In function 'std::variant<bool, std::vector<int, std::allocator<int> > > find_journey(int, int, std::vector<int>, std::vector<int>)':
islands.cpp:13:21: warning: unused variable 'v' [-Wunused-variable]
   13 |       int u = U[i], v = V[i];
      |                     ^

• Subtask 1: 5 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 45