Submission #3776041

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Source Code Expand

#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long double;

const double PI = 3.1415926535897932384626433832795;

const int dx[] = { 0, 1, 0, -1 };
const int dy[] = { -1, 0, 1, 0 };

int gcd(int x, int y) { return y ? gcd(y, x % y) : abs(x); }
ll gcd(ll x, ll y) { return y ? gcd(y, x % y) : abs(x); }
int lcm(int x, int y) { return x / gcd(x, y) * y; }
ll lcm(ll x, ll y) { return x / gcd(x, y) * y; }

double a, b, c;

double f(double t) {
	return a * t + b * sin(c * t * PI);
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	cin >> a >> b >> c;

	const double HIT_TIME = 100.0;
	double left = -1e6, right = 1e6, mid = 0;
	for (int i = 0; i < 1e6; i++) {
		mid = (left + right) / 2.0;
		double v = f(mid);

		if (v < HIT_TIME) {
			left = mid;
		} else {
			right = mid;
		}
	}

	printf("%.14lf\n", mid);
	return 0;
}

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