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Hatena Summer Intern 2019 application quiz
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import std.stdio, std.string, std.json, std.ascii, std.algorithm; | |
string rotN(string s, int n) | |
in { | |
assert (0 <= n && n <= 26); | |
} | |
out (result) { | |
assert(result.length == s.length); | |
} | |
do { | |
const auto N = uppercase.length; | |
char[] r = new char[](s.length); | |
foreach (i, c; s) { | |
if (uppercase.canFind(c)) { | |
r[i] = (c - 'A' + n) % N + 'A'; | |
} else if (lowercase.canFind(c)) { | |
r[i] = (c - 'a' + n) % N + 'a'; | |
} else { | |
r[i] = c; | |
} | |
} | |
return r.idup; | |
} | |
unittest { | |
import std.exception; | |
import core.exception: AssertError; | |
auto s = "Hello world ABC123 !\"#$%&'()~'"; | |
assert(s == s.rotN(0).rotN(26-0)); | |
assert(s == s.rotN(1).rotN(26-1)); | |
assert(s == s.rotN(13).rotN(26-13)); | |
assert(s == s.rotN(14).rotN(26-14)); | |
assert(s == s.rotN(15).rotN(26-15)); | |
assert(s == s.rotN(25).rotN(26-25)); | |
assert(s == s.rotN(26)); | |
assert("" == "".rotN(13)); | |
assertThrown!AssertError(s.rotN(-1)); | |
assertThrown!AssertError(s.rotN(27)); | |
assertThrown!AssertError(s.rotN(100)); | |
} | |
void main() | |
{ | |
auto input = readln.strip; | |
auto json = JSONValue(); | |
json["github"] = "theoldmoon0602"; | |
json["twitter"] = "theoldmoon0602"; | |
json["homepage"] = "https://furutsuki.hatenablog.com/"; | |
json["answer"] = rotN(input, 13); | |
writeln(json.toPrettyString(JSONOptions.doNotEscapeSlashes)); | |
} |
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