C++程序检查猫戴彩色帽子是否正确
假设我们有一个包含N个元素的数组A。考虑有N只猫,它们从1到N编号。每只猫都戴着一顶帽子,第i只猫说“除了我之外,其他N-1只猫的帽子总共有A[i]种不同的颜色”。我们必须检查是否存在一个帽子的颜色序列,该序列与猫的备注一致。
因此,如果输入类似于A = [1, 2, 2],则输出将为True,因为如果猫1、2和3分别戴着红色、蓝色和蓝色的帽子,则这与猫的备注一致。
为了解决这个问题,我们将遵循以下步骤:
mn := inf, mx = 0, cnt = 0
n := size of A
Define an array a of size (n + 1)
for initialize i := 1, when i <= n, update (increase i by 1), do:
a[i] := A[i - 1]
mn := minimum of mn and a[i]
mx = maximum of mx and a[i]
for initialize i := 1, when i <= n, update (increase i by 1), do:
if a[i] is same as mn, then:
(increase cnt by 1)
if mx is same as mn, then:
if mn is same as n - 1 or 2 * mn <= n, then:
return true
Otherwise
return false
otherwise when mx is same as mn + 1, then:
if mn >= cnt and n - cnt >= 2 * (mx - cnt), then:
return true
Otherwise
return false
Otherwise
return false示例
让我们看看下面的实现以获得更好的理解:
#include <bits/stdc++.h>
using namespace std;
bool solve(vector<int> A) {
int mn = 99999, mx = 0, cnt = 0;
int n = A.size();
vector<int> a(n + 1);
for (int i = 1; i <= n; ++i) {
a[i] = A[i - 1];
mn = min(mn, a[i]), mx = max(mx, a[i]);
}
for (int i = 1; i <= n; ++i)
if (a[i] == mn)
++cnt;
if (mx == mn) {
if (mn == n - 1 || 2 * mn <= n)
return true;
else
return false;
}
else if (mx == mn + 1) {
if (mn >= cnt && n - cnt >= 2 * (mx - cnt))
return true;
else
return false;
}
else
return false;
}
int main() {
vector<int> A = { 1, 2, 2 };
cout << solve(A) << endl;
}输入
{ 1, 2, 2 }输出
1
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