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Code Issues 1 Releases Wiki Activity

Add triangles examples.

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This commit is contained in:
bakpakin 2018-03-25 18:51:31 -04:00
parent b70d6cad1b
commit 080caf31a7
2 changed files with 48 additions and 9 deletions
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39
examples/maxtriangle.dst Normal file
View File

@ -0,0 +1,39 @@
(defn vmap2 [f m1 m2]
(def len (length m1))
(def arr [])
(for [i 0 len] (array-push arr (f (get m1 i) (get m2 i))))
arr)
(defn reduce [s f c]
(var res s)
(for [i 0 (length c)]
(:= res (f res (get c i))))
res)
(defn max1 [l r] (if (< l r) r l))
(defn myfold [xs ys]
(def xs1 (tuple-prepend xs 0))
(def xs2 (tuple-append xs 0))
(def m1 (vmap2 + xs1 ys))
(def m2 (vmap2 + xs2 ys))
(vmap2 max1 m1 m2))
(defn max [a]
(var m (get a 0))
(for [i 0 (length a)]
(if (< m (get a i))
(:= m (get a i))))
m)
(defn maxpath [t]
(max (reduce [] myfold t)))
(def triangle [
[3]
[7 10]
[4 3 7]
[8 9 1 3]
])
(print (maxpath triangle))

18
src/core/tuple.c
View File

@ -127,25 +127,25 @@ static int cfun_slice(DstArgs args) {
static int cfun_prepend(DstArgs args) { static int cfun_prepend(DstArgs args) {
const Dst *t; const Dst *t;
int32_t len;
Dst *n; Dst *n;
if (args.n != 2) return dst_throw(args, "expected 2 arguments"); if (args.n != 2) return dst_throw(args, "expected 2 arguments");
if (!dst_checktype(args.v[0], DST_TUPLE)) return dst_throw(args, "expected tuple"); if (!dst_seq_view(args.v[0], &t, &len)) return dst_throw(args, "expected tuple/array");
t = dst_unwrap_tuple(args.v[0]); n = dst_tuple_begin(len + 1);
n = dst_tuple_begin(dst_tuple_length(t) + 1); memcpy(n + 1, t, sizeof(Dst) * len);
memcpy(n + 1, t, sizeof(Dst) * dst_tuple_length(t));
n[0] = args.v[1]; n[0] = args.v[1];
return dst_return(args, dst_wrap_tuple(dst_tuple_end(n))); return dst_return(args, dst_wrap_tuple(dst_tuple_end(n)));
} }
static int cfun_append(DstArgs args) { static int cfun_append(DstArgs args) {
const Dst *t; const Dst *t;
int32_t len;
Dst *n; Dst *n;
if (args.n != 2) return dst_throw(args, "expected 2 arguments"); if (args.n != 2) return dst_throw(args, "expected 2 arguments");
if (!dst_checktype(args.v[0], DST_TUPLE)) return dst_throw(args, "expected tuple"); if (!dst_seq_view(args.v[0], &t, &len)) return dst_throw(args, "expected tuple/array");
t = dst_unwrap_tuple(args.v[0]); n = dst_tuple_begin(len + 1);
n = dst_tuple_begin(dst_tuple_length(t) + 1); memcpy(n, t, sizeof(Dst) * len);
memcpy(n, t, sizeof(Dst) * dst_tuple_length(t)); n[len] = args.v[1];
n[dst_tuple_length(t)] = args.v[1];
return dst_return(args, dst_wrap_tuple(dst_tuple_end(n))); return dst_return(args, dst_wrap_tuple(dst_tuple_end(n)));
} }