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exer_4.c
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exer_4.c
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#include <stdlib.h>
#include <time.h>
#include <stdio.h>
#define SIZE 100
#define N_MAX 1000000
#define D 12
void crossover(int *parent1, int *parent2, int *child);
void mutation(int *child);
int calc_outcome(int *individual);
static double mut_rate = 1/(double)D;
static int optimal_sol = D/3*30;
int main() {
int t = 1;
int mu = SIZE; // the population size
int n = 1;
int P[mu][D];
int *parent1;
int *parent2;
int child[D];
int child_copy[D];
int outcome;
int *bsf; // best-so-far solution
srand((unsigned int)(time(NULL)));
// population initialization.
int i, j;
bsf = P[0];
for(i=0; i<mu; i++) {
for(j=0; j<D; j++) {
if((double)rand()/(double)RAND_MAX < 0.5 ) {
P[i][j] = 0;
} else {
P[i][j] = 1;
}
}
if(calc_outcome(P[i]) > calc_outcome(bsf)) {
bsf = P[i];
}
}
while(n <= N_MAX ) {
int index1 = rand()%mu; // Use indices to refer to each individual.
int index2, index3, index4;
while(index1 == (index2 = rand()%mu)) {
} // Make sure each individual is different from others.
while(index2 == (index3 = rand()%mu)) {
}
while(index3 == (index4 = rand()%mu)) {
}
parent1 = (calc_outcome(P[index1]) > calc_outcome(P[index2])) ? P[index1] : P[index2];
parent2 = (calc_outcome(P[index3]) > calc_outcome(P[index4])) ? P[index3] : P[index4];
crossover(parent1, parent2, child);
mutation(child);
outcome = calc_outcome(child);
n++;
// step 5, update the best-so-far solution
int bsf_out = calc_outcome(bsf);
if(outcome > bsf_out) {
for(j=0;j<D;j++) {
child_copy[j] = child[j];
}
bsf = child_copy;
bsf_out = outcome;
}
/*
for(i=0; i<mu; i++) {
for(j=0; j<D; j++) {
printf("%d",P[i][j]);
}
printf("\n");
}*/
for(j=0; j<D; j++) {
printf("%d",child[j]);
}
printf(" child %d\n",outcome);
// step 6, environmental selection
int tmp = rand()%mu;
if(outcome >= calc_outcome(P[tmp])) {
for(j=0;j<D;j++) {
P[tmp][j] = child[j];
}
}
t++;
printf("The best-so-far solution: ");
for(j=0;j<D;j++) {
printf("%d",bsf[j]);
}
printf("\tObjective function value: %d\n", bsf_out);
if(bsf_out == optimal_sol) break;
}
printf("%d\n",n);
return 0;
}
void crossover(int *parent1, int *parent2, int child[]) {
int j;
for(j=0;j<D;j++) {
if((double)rand()/(double)RAND_MAX < 0.5) {
child[j] = parent1[j];
} else {
child[j] = parent2[j];
}
}
}
void mutation(int *child) {
int j = 0;
for(;j<D;j++) {
if((double)rand()/(double)RAND_MAX < mut_rate) {
if(child[j] == 0) {
child[j] = 1;
} else {
child[j] = 0;
}
}
}
}
int calc_outcome(int *a) {
int out = 0;
int x_tmp = 0;
int k = 0;
while(k<D){
if(a[k]==1 && a[k+1]==1 && a[k+2]==1) {
x_tmp = 30;
} else if(a[k]==1 && a[k+1]==1 && a[k+2]==0) {
x_tmp = 0;
} else if(a[k]==1 && a[k+1]==0 && a[k+2]==1) {
x_tmp = 0;
} else if(a[k]==0 && a[k+1]==1 && a[k+2]==1) {
x_tmp = 0;
} else if(a[k]==1 && a[k+1]==0 && a[k+2]==0) {
x_tmp = 14;
} else if(a[k]==0 && a[k+1]==1 && a[k+2]==0) {
x_tmp = 22;
} else if(a[k]==0 && a[k+1]==0 && a[k+2]==1) {
x_tmp = 26;
} else if(a[k]==0 && a[k+1]==0 && a[k+2]==0) {
x_tmp = 28;
}
out += x_tmp;
k = k+3;
}
return out;
}