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Slightly more consise update step.

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Bert Peters
2017-12-20 15:08:25 +01:00
parent a9034c9208
commit eee1f48629
1 changed files with 3 additions and 8 deletions
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11
2017/day-20/solution.r
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@@ -8,18 +8,13 @@ input <- read.csv(tc, header=FALSE, sep=" ")
close(tc)
accs <- rowSums(abs(input[,7:9]))
speeds <- rowSums(abs(input[,4:6]))
perm <- order(accs, speeds)
perm <- order(rowSums(abs(input[,7:9])), rowSums(abs(input[,4:6])))
print(perm[1] - 1)
for (i in 1:100) {
# Update positions, speeds
for (coord in 1:3) {
input[,coord+3] <- input[,coord+3] + input[,coord+6]
input[,coord] <- input[,coord] + input[,coord+3]
}
input[,4:6] <- input[,4:6] + input[,7:9]
input[,1:3] <- input[,1:3] + input[,4:6]
dups <- !(duplicated(input[,1:3]) | duplicated(input[,1:3], fromLast=TRUE))