备战NOIP——模板复习8

这里只有模板，并不作讲解，仅为路过的各位做一个参考以及用做自己复习的资料，转载注明出处。

模拟退火（SA）

/*Copyright: Copyright (c) 2018
*Created on 2018-10-28  
*Author: 十甫
*Version 1.0 
*Title: SA
*Time: 5 mins
*/
#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstdlib>
#include<ctime>
using namespace std;
const double delta = 0.999;
const double zero = 1e-3;
const double eps = 1e-7;

double calc(double k) {
}

int main() {
	srand(time(NULL));
	int n;
	scanf("%d", &n);
	while(n--) {
		//scanf()
		double T = 1000.0;
		double ans = 0.0, x = 0.0;
		while(T > zero) {
			double x_ = x + ((rand() * 2) - RAND_MAX) * T;
			double k = calc(x_) - ans;
			if(k > 0) {
				ans = k, x = x_;
			} else {
				if(exp(-k / T) * RAND_MAX > rand()) {
					x = x_;
				}
			}
			T *= delta;
		}
		printf("%.5lf\n", ans);
	}
	return 0;
}