seqan::String<int> computeScore(TText const & text, TPattern const & pattern)
{
seqan::String<int> score;
seqan::resize(score, seqan::length(text), 0);
for (unsigned i = 0; i < seqan::length(text) - seqan::length(pattern) + 1; ++i)
score[i] = computeLocalScore(infix(text, i, i + seqan::length(pattern)), pattern);
return score;
}
void updateWrongs(puzzle p, int **cur_sol, int *wrongs, int *wsize_ptr, int i)
{
int off_i[4]={1, -1, -p.w_size, p.w_size};
int k, ls, j;
for(k=0; k<4; k++){ // for each neighbor(i):
j=i+off_i[k];
if(j>=0 && j<p.n){
ls = computeLocalScore(p, cur_sol, cur_sol[j][0],j, cur_sol[j][1]);
if(ls==MAX_LOCAL_SCORE){
removeWrong(p, cur_sol, wrongs, wsize_ptr, j);
} else {
addWrong(p, cur_sol, wrongs, wsize_ptr, j);
}
}
}
return;
}
/*
adaptiveSearch
return n:number of wrong pieces left
*/
int adaptiveSearch(puzzle p, int **cur_sol)
{
int* wrongs; //array of wrong pieces
wrongs = (int *) malloc(p.n*sizeof(int));
int n, found=1, new_score, score, i, j, tmp, rot, max, max_rot, old, index, jndex;
//compute wrong pieces' array and actual score
score=computeScore(p, cur_sol, wrongs, &n);
if (n==0){
//previous heuristics has already found optimum.
return(0);
}
while(found){
found=0;
#ifndef WRONGS
n=p.n;
#endif
for(i=0; i<n && !found;i++){
/*try rotating the piece in place */
index=i;
#ifdef WRONGS
index=wrongs[i];
#endif
max_rot=-1;
old=max=computeLocalScore(p, cur_sol, cur_sol[index][0], index, cur_sol[index][1]);
for(rot=0;rot<4;rot++){
tmp=computeLocalScore(p, cur_sol, cur_sol[index][0], index, rot);
if(tmp>max){
max=tmp;
max_rot=rot;
}
}
if(max_rot>=0){
cur_sol[index][1]=max_rot;
score+=max-old;
//TODO: update wrongs
found=1;
}
for(j=i+1;j<n && !found;j++){
jndex=j;
#ifdef WRONGS
jndex=wrongs[j];
#endif
//swap one to one between 2 wrong pieces
new_score=trySwapPieces(p, cur_sol, score, index, jndex, wrongs,&n );
if(new_score>score){
found=1;
score=new_score;
}
//else try other 2 pieces
}
}
}
free(wrongs);
return(0);
}
/*trySwapPieces
* compute the score the puzzle WOULD have, if swap occured
* p:puzzle
* i, j: pieces to be swap
* returns: new total score with the swap
*
*/
int trySwapPieces(puzzle p,int **cur_sol,int score, int i, int j, int *wrongs, int *wsize_ptr){
//newscores=oldscores-computeLocalScore(....,cur_sol, i)-computeLocalScore(.....,cur_sol, j)
//.... +computeLocalScore(...., swapped_sol, i)+computeLocalScore(....,swapped_sol, j);
int rot, tmp, old_i, old_j, old_rot_i, old_rot_j, k, maxi=0, maxj=0, max_rot_i, max_rot_j, found, w, skip=0;
int scoreold=score;
//store actual pieces and rotations:
old_i=cur_sol[i][0];
old_j=cur_sol[j][0];
old_rot_i=cur_sol[i][1];
old_rot_j=cur_sol[j][1];
score-=computeLocalScore(p, cur_sol, cur_sol[i][0], i, cur_sol[i][1]);
score-=computeLocalScore(p, cur_sol, cur_sol[j][0], j, cur_sol[j][1]);
if(isNeighbor(p, i, j)){
/* try rotating the two pieces in place */
score+=checkEdge(p, cur_sol, i, j); // score for common edge was removed twice, so re-add once
for(cur_sol[i][1]=0;cur_sol[i][1]<4;cur_sol[i][1]++){ //rotate i
for(cur_sol[j][1]=0;cur_sol[j][1]<4;cur_sol[j][1]++){ //rotate j
k=computeLocalScore(p, cur_sol, old_i, i, cur_sol[i][1]); //score from i
tmp=computeLocalScore(p, cur_sol, old_j, j, cur_sol[j][1]); //score from j
if(tmp+k>maxi+maxj){
maxi=k;
maxj=tmp;
max_rot_i=cur_sol[i][1];
max_rot_j=cur_sol[j][1];
}
}
}
score+=maxi+maxj; // this adds one point for each "good" edge, so the common edge has double score
//update solution
cur_sol[i][1]=max_rot_i;
cur_sol[j][1]=max_rot_j;
score-=checkEdge(p, cur_sol, i, j); //score for common edge has been added twice, then subtract once
if (score>scoreold){
skip=1; //-> don't try swapping; maybe next time...
} else {
//restore
cur_sol[i][1]=old_rot_i;
cur_sol[j][1]=old_rot_j;
score-=maxi+maxj;
}
if(!skip){
/* swap the pieces (if leads to better score) */
cur_sol[i][0]=old_j; //move j-->i
cur_sol[j][0]=old_i; //move i-->j
for(cur_sol[i][1]=0;cur_sol[i][1]<4;cur_sol[i][1]++){ //rotate i
for(cur_sol[j][1]=0;cur_sol[j][1]<4;cur_sol[j][1]++){ //rotate j
k=computeLocalScore(p, cur_sol, old_j, i, cur_sol[i][1]); //score from i
tmp=computeLocalScore(p, cur_sol, old_i, j, cur_sol[j][1]); //score from j
if(tmp+k>maxi+maxj){
maxi=k;
maxj=tmp;
max_rot_i=cur_sol[i][1];
max_rot_j=cur_sol[j][1];
}
}
}
score+=maxi+maxj; // this adds one point for each "good" edge, so the common edge has double score
score-=checkEdge(p, cur_sol, i, j); //score for common edge has been added twice, then subtract once
if (score>scoreold){
//update solution
cur_sol[i][1]=max_rot_i;
cur_sol[j][1]=max_rot_j;
} else {
//restore old values:
cur_sol[i][0]=old_i;
cur_sol[i][1]=old_rot_i;
cur_sol[j][0]=old_j;
cur_sol[j][1]=old_rot_j;
score=scoreold;
}
}
} else {
for(rot=0;rot<4;rot++){
tmp=computeLocalScore(p, cur_sol, old_i, j, rot);
if(tmp>maxi){
maxi=tmp;
max_rot_i=rot;
}
}
score+=maxi;
maxj=0;
for(rot=0;rot<4;rot++){
tmp=computeLocalScore(p, cur_sol, old_j, i, rot);
if(tmp>maxj){
maxj=tmp;
max_rot_j=rot;
}
}
score+=maxj;
if(score>scoreold){
cur_sol[j][0]=old_i;
cur_sol[j][1]=max_rot_i;
cur_sol[i][0]=old_j;
cur_sol[i][1]=max_rot_j;
}else{
return(scoreold);
}
}
/* update wrongs vector */
#ifdef WRONGS
if(maxi==MAX_LOCAL_SCORE){
removeWrong(p, cur_sol, wrongs, wsize_ptr, i);
}
// update neighbors of i
updateWrongs(p, cur_sol, wrongs, wsize_ptr, i);
if(maxj==MAX_LOCAL_SCORE){
removeWrong(p, cur_sol, wrongs, wsize_ptr, i);
}
// update neighbors of j
updateWrongs(p, cur_sol, wrongs, wsize_ptr, i);
#endif
return(score);
}
