Coding with Squared Strings
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| #include <string>
using namespace std;
class CodeSqStrings
{
public:
static std::string code(const std::string &strng) {
int n = 1;
for(; n * n < strng.length(); n++);
vector<string> mat(n,string(n,'\v'));
for(int j = n - 1, p = 0; j >= 0 and p < strng.length(); j--) {
for(int i = 0; i < n and p < strng.length(); i++) {
mat[i][j] = strng[p++];
}
}
string res = "";
for(int i = 0; i < n; i++) {
res += mat[i];
res.push_back('\n');
}
res.pop_back();
return res;
}
static int len(const std::string &strng) {
int res = 0;
for(; res < strng.length() and strng[res] != '\n'; res++);
return res;
}
static std::string decode(const std::string &strng) {
int n = len(strng);
vector<string> mat(n,string(n,'\v'));
for(int i = 0, p = 0; i < n; i++) {
for(int j = 0; j < n; j++) {
mat[i][j] = strng[p++];
}
p++;
}
string res = "";
for(int j = n - 1, p = 0; j >= 0 and p < strng.length(); j--) {
for(int i = 0; i < n and p < strng.length(); i++) {
res.push_back(mat[i][j]);
}
}
while(res.size() and res.back() == '\v') res.pop_back();
return res;
}
};
|
