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q08.R
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library(data.table)
test=fread('/home/eqiu/code_projects/aoc_2022/data/input_8',header=F,fill=T)#,nrows=9,sep='\t'
# test=data.table(V1=as.character(c(
# 30373
# ,25512
# ,65332
# ,33549
# ,35390
# )))
t_matrix=matrix(as.numeric(unlist(strsplit(test$V1,split='')) ),nrow=nrow(test),ncol=nrow(test) )
test2=as.data.table(t_matrix)
#p1
# c_table=c()
# for(i in 1:nrow(test)){
#
# last=-Inf
# str_i=test[i,]$V1
# counter=0
# for(j in 1:nchar(str_i)){
# tree=as.numeric(substr(str_i,j,j))
# if( tree >last){
# # counter=counter+1
# c_table=c(c_table,paste0(i,'_',j) )
# last=tree
# }
# }
#
# last2=-Inf
# counter2=0
# str_i2=paste(rev(strsplit(str_i,split='')[[1]] ),collapse='')
# for(j in 1:nchar(str_i2)){
# tree=as.numeric(substr(str_i2,j,j))
# if( tree >last2){
# # counter2=counter2+1
# c_table=c(c_table,paste0(i,'_',nrow(test)-j+1) )
# last2=tree
# }
# }
#
# # c_table[i,`:=`(c1=counter,c2=counter2)]
# }
#
#
#
#
# for(i in 1:nrow(test2)){
# last=-Inf
# str_i=paste(unlist(test2[i,]),collapse='')
# counter=0
# for(j in 1:nchar(str_i)){
# tree=as.numeric(substr(str_i,j,j))
# if( tree >last){
# # counter=counter+1
# c_table=c(c_table,paste0(j,'_',i) )
# last=tree
# }
# }
#
# last2=-Inf
# counter2=0
# str_i2=paste(rev(strsplit(str_i,split='')[[1]] ),collapse='')
# for(j in 1:nchar(str_i2)){
# tree=as.numeric(substr(str_i2,j,j))
# if( tree >last2){
# # counter2=counter2+1
# c_table=c(c_table,paste0(nrow(test)-j+1,'_',i) )
# last2=tree
# }
# }
#
# # c_table[i,`:=`(c3=counter,c4=counter2)]
# }
#
#
# length(unique(c_table))
##############
max_score=0
for(i in 1:nrow(t_matrix)){
for(j in 1:ncol(t_matrix)){
base_height=t_matrix[i,j]
l=0
r=0
u=0
d=0
lx=i-l-1
rx=i+r+1
ux=j+u+1
dx=j-d-1
if(lx<=0|lx>nrow(t_matrix)){
l_n=Inf
}else{
l_n=t_matrix[i-l-1,j]
l=1
}
if(rx<=0|rx>nrow(t_matrix)){
r_n=Inf
}else{
r_n=t_matrix[i+r+1,j]
r=1
}
if(ux<=0|ux>ncol(t_matrix)){
u_n=Inf
}else{
u_n=t_matrix[i,j+u+1]
u=1
}
if(dx<=0|dx>ncol(t_matrix)){
d_n=Inf
}else{
d_n=t_matrix[i,j-d-1]
d=1
}
while(l_n<base_height){
ind1=i-l-1
ind2=j
if(ind1<=0 |ind1>nrow(t_matrix)|ind2<=0 |ind2>ncol(t_matrix)){
break
}
l=l+1
l_n=t_matrix[ind1,ind2]
print(l_n)
}
while(r_n<base_height){
ind1=i+r+1
ind2=j
if(ind1<=0 |ind1>nrow(t_matrix)|ind2<=0 |ind2>ncol(t_matrix)){
break
}
r=r+1
r_n=t_matrix[ind1,ind2]
}
while(d_n<base_height){
ind1=i
ind2=j-d-1
if(ind1<=0 |ind1>nrow(t_matrix)|ind2<=0 |ind2>ncol(t_matrix)){
break
}
d=d+1
d_n=t_matrix[ind1,ind2]
}
while(u_n<base_height){
ind1=i
ind2=j+u+1
if(ind1<=0 |ind1>nrow(t_matrix)|ind2<=0 |ind2>ncol(t_matrix)){
break
}
u=u+1
u_n=t_matrix[ind1,ind2]
}
score=l*r*u*d
print(paste0(i,'_',j))
print(c(l,r,u,d))
print(score)
if(score>max_score){
max_score=score
}
}
}
# max_score