Submission #792277

#	Time	Username	Problem	Language	Result	Execution time	Memory
792277		MattTheNub	Prisoner Challenge (IOI22_prison)	C++17	0 / 100	5 ms	852 KiB

prison

#include "prison.h"

#include <bits/stdc++.h>
#include <vector>
using namespace std;
template <class T> using v = vector<T>;

v<v<int>> ans;
void construct(int i, int l, int r, int cur) {
  if (l == r) {
    return;
  }

  int m = (l + r) / 2;

  for (int j = l; j <= m; j++) {
    ans[i][j] = (i + 1) / 2 + 1;
  }
  for (int j = m + 1; j <= r; j++) {
    ans[i][j] = (i + 1) / 2 + 2;
  }
  construct((i + 1) / 2 + 1, l, m, 1 - cur);
  for (int j = m + 1; j <= r; j++) {
    ans[(i + 1) / 2 + 1][j] = -(1 - cur) - 1;
  }
  construct((i + 1) / 2 + 2, m + 1, r, 1 - cur);
  for (int j = l; j <= m; j++) {
    ans[(i + 1) / 2 + 2][j] = -cur - 1;
  }
}

v<v<int>> devise_strategy(int N) {
  ans.assign(__lg(2 * N) * 2 + 1, v<int>(N + 1));
  for (int i = 0; i < ans.size(); i++) {
    ans[i][0] = ((i + 1) / 2) & 1;
    for (int j = 1; j <= N; j++) {
      ans[i][j] = -ans[i][0] - 1;
    }
  }
  construct(0, 1, N, 1);

  return ans;
}

Compilation message (stderr)

prison.cpp: In function 'v<std::vector<int> > devise_strategy(int)':
prison.cpp:34:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |   for (int i = 0; i < ans.size(); i++) {
      |                   ~~^~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 90