蛮力法求解旅行商问题 求C++代码

发布网友 发布时间：2022-08-15 09:22

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热心网友 时间：2023-10-24 01:58

#include<stdlib.h>
#include<cmath>
#include<algorithm>
using namespace std;
static double Tmax = 10, Tmin = 0.1, r = 0.999999;
static int k = 100;
inline void random_sele(int &fl, int &fp, int arr[], int n)
{
do
{
fl = rand() % n;
fp = rand() % n;
} while (fl == arr[fp] || arr[fl] == arr[fp]);
};
inline bool accept(double r1, double r2, double T)
{
const unsigned int MASK((1 << 30) - 1);
double p = 1.0 / (1.0 + exp((r2 - r1) / T));
unsigned int temp1=((rand()<<20)^(rand()<<10)^rand())&MASK;
unsigned int temp2=((rand()<<20)^(rand()<<10)^rand())&MASK;
double res=(1.0*temp1+1.0*temp2/MASK);
return res < p*MASK;
}
void set_SA()
{
printf(" Tmax Tmin r k\n");
printf(" %.8f %.8f %.8f %d \n",Tmax,Tmin,r,k);
printf("Input Tmax,Tmin,r,k:\n");
scanf("%lf%lf%lf%d",&Tmax,&Tmin,&r,&k);
}
void TSP_SA(int arr[], double &evl, int n, double map[][2000])
{
double r1, r2, T = Tmax;
int i, fl, sl, fp, sp;
int show_s=0;
srand(11827);
while (T >= Tmin)
{
for (i = 0; i < k; i++)
{
random_sele(fl, fp, arr, n);
sl = arr[fl], sp = arr[fp];
r1 = map[fl][sl] + map[fp][sp] + map[sp][arr[sp]];
r2 = map[fl][sp] + map[sp][sl] + map[fp][arr[sp]];
if (accept(r1, r2, T))
{
arr[fp] = arr[sp];
arr[fl] = sp;
arr[sp] = sl;
sl = sp;
evl = evl + r2 - r1;
}
}
if(++show_s==1000000/k)
{
printf("T=%f evl=%f\n",T,evl);
show_s=0;
}
T *= r;
}
}