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桁毎に何か計算するときに便利なライブラリ。
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class Keta { | |
vector<int> digits; | |
public: | |
Keta(ll i) : digits(i == 0 ? 1 : log10(i) + 1) { | |
for (int k = 0; k < digits.size(); k++) { | |
digits[k] = i % 10; | |
i /= 10; | |
} | |
reverse(digits.begin(), digits.end()); | |
} | |
int keta() { | |
return digits.size(); | |
} | |
int get(int index) { | |
assert(index < keta()); | |
return digits[index]; | |
} | |
}; |
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