Created
November 19, 2019 02:55
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| ops <- list('+' = `+`, '-' = `-`, '*' = `*`, '/' = `/`) | |
| eval_expr <- function(f1, f2, f3) { | |
| f2(f1(2, .5), f3(1.5, 4)) == -6.25 | |
| } | |
| find <- function() { | |
| m <- gtools::permutations(4, 3, 1:4) | |
| for (r in 1:nrow(m)) { | |
| if (do.call(eval_expr, setNames(ops[m[r,]], NULL))) { | |
| return(names(ops)[m[r,]]) | |
| } | |
| } | |
| } |
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