C ++程序找出是否可以从给定矩阵组成回文矩阵
假设给定一个维度为 hx w 的矩阵。该矩阵包含英文字母。我们必须创建另一个包含回文行和列的矩阵,即每一行和每一列都是回文。为此,可以从给定的矩阵中完成任何行和列的排列;但是不能更改任何元素,即不能将“a”更改为“b”。如果可以从给定的矩阵生成回文矩阵,则返回 true;否则,我们返回 false。
因此,如果输入类似于 h = 4, w = 4, mat = {"xxyy", "xyxx", "yxxy", "xyyy"},那么输出将为真。
脚步
为了解决这个问题,我们将遵循以下步骤 -
Define one map mpDefine an array count of size 4.
for initialize i := 0, when i < h, update (increase i by 1), do:
for initialize j := 0, when j < w, update (increase j by 1), do:
(increase tp[mat[i, j]] by 1)
for each value val in tp, do:
increase count[second value of val mod 4] by 1
check := true
if h mod 2 is same as 0 and w mod 2 is same as 0, then:
if count[1] + count[2] + count[3] > 0, then:
check := false
otherwise when h mod 2 is same as 1 and w mod 2 is same as 1, then:
if count[1] + count[3] > 1, then:
check := false
otherwise when count[2] > h / 2 + w / 2, then:
check := false
Otherwise
if count[1] + count[3] > 0, then:
check := false
otherwise when h mod 2 is same as 1 and count[2] > w / 2, then:
check := false
otherwise when w mod 2 is same as 1 and count[2] > h / 2, then:
check := false
return check
示例
让我们看看以下实现以更好地理解 -
#include <bits/stdc++.h>using namespace std;
const int INF = 1e9;
bool solve(int h, int w, vector<string> mat){
map<char, int> tp;
vector<int> count(4);
for (int i = 0; i < h; ++i) {
for (int j = 0; j < w; ++j)
tp[mat[i][j]]++;
}
for (auto val : tp)
count[val.second % 4]++;
bool check = true;
if (h % 2 == 0 && w % 2 == 0) {
if (count[1] + count[2] + count[3] > 0)
check = false;
}
else if (h % 2 == 1 && w % 2 == 1) {
if (count[1]+count[3] > 1)
check = false;
else if (count[2] > h / 2 + w / 2)
check = false;
} else {
if (count[1] + count[3] > 0)
check = false;
else if (h % 2 == 1 && count[2] > w / 2)
check = false;
else if (w % 2 == 1 && count[2] > h / 2)
check = false;
}
return check;
}
int main() {
int h = 4, w = 4;
vector<string> mat = {"xxyy", "xyxx", "yxxy", "xyyy"};
cout<< solve(h, w, mat);
return 0;
}
输入
4, 4, {"xxyy", "xyxx", "yxxy", "xyyy"}输出结果
1
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