提出 #4210765

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ソースコード 拡げる

#include <bits/stdc++.h>

using namespace std;
#define reg register
#define rep(i, a, b) for (reg int i = (int) a; i <= (int) b; i++)
#define rev(i, a, b) for (reg int i = (int) a; i >= (int) b; i--)
#define _r read()

inline int read();

int main() {
	unsigned long long k = _r, a = _r, b = _r;
	if (b <= a + 1) {
		cout << k + 1 << endl;
		return 0;
	}
	if (k < a - 1) {
		cout << k + 1 << endl;
		return 0;
	}
	k -= a - 1;
	a += (k / 2) * (b - a) + (k % 2);
	cout << a << endl;
	return 0;
}

inline int read() {
	reg int a = 0, c = getchar(), s = c == '-';
	while (!isdigit(c)) c = getchar();
	while (isdigit(c)) a = (a << 1) + (a << 3) + (c ^ 48), c = getchar();
	return s ? -a : a;
}

提出情報

ジャッジ結果