【題目敘述】https://zerojudge.tw/ShowProblem?problemid=d671
【Tag】內建數學函數 sqrt( ),row-dominant array
#include <iostream>
#include <cmath>
using namespace std;
int main() {
int T;
string s;
cin >> T;
getline(cin, s);
while (T--){
getline(cin, s); //密文包含空白
int sq = sqrt(s.size());
if (sq * sq != s.size()){
cout << "INVALID\n";
continue;
}
for (int col = 0; col < sq; col++){
for (int row = 0; row < sq; row++){
cout << s[row * sq + col];
}
}
cout << "\n";
}
return 0;
}