// see goolgec //. please enter a number bt 1..14 var primes = listOf(2,3, 5, 7, 11, 13, 17, 19, 23, 29,31, 37, 41, 43, 47, 53, 59, 61, 67, 71,73, 79, 83, 89, 97, 101, 103, 107, 109, 113,127, 131, 137, 139, 149, 151, 157, 163, 167, 173,179, 181, 191, 193, 197, 199, 211, 223, 227, 229,233, 239, 241, 251, 257, 263, 269, 271, 277, 281,283, 293, 307, 311, 313, 317, 331, 337, 347, 349,353, 359, 367, 373, 379, 383, 389, 397, 401, 409,419, 421, 431, 433, 439, 443, 449, 457, 461, 463,467, 479, 487, 491, 499, 503, 509, 521, 523, 541,547, 557, 563, 569, 571, 577, 587, 593, 599, 601,607, 613, 617, 619, 631, 641, 643, 647, 653, 659,661, 673, 677, 683, 691, 701, 709, 719, 727, 733,739, 743, 751, 757, 761, 769, 773, 787, 797, 809,811, 821, 823, 827, 829, 839, 853, 857, 859, 863,877, 881, 883, 887, 907, 911, 919, 929, 937, 941,947, 953, 967, 971, 977, 983, 991, 997, 1009, 1013,1019, 1021, 1031, 1033, 1039, 1049, 1051, 1061, 1063, 1069,1087, 1091, 1093, 1097, 1103, 1109, 1117, 1123, 1129, 1151,1153, 1163, 1171, 1181, 1187, 1193, 1201, 1213, 1217, 1223) var dir = listOf(listOf(0,1),listOf(1,0),listOf(0,-1),listOf(-1,0)) // 0 = right, 1 = down, 2 = left, 3 = up var size = 5 //var spiral = MutableList(size,{MutableList(size,{0})}) var dIdx = 0 var pos = listOf(0,-1) fun main(args: Array) { println("Spiral of primes") size =Math.min((readLine()!!).toInt(),14) var spiral = MutableList(size,{MutableList(size,{0})}) for(i in 0..size*size) if (isValid(pos,dir[dIdx],spiral)){ pos=vadd(pos,dir[dIdx]) spiral[pos[0]][pos[1]] = primes[i] // pos += dir[dIdx] } else{ dIdx = (dIdx+1)%4 pos=vadd(pos,dir[dIdx]) spiral[pos[0]][pos[1]] = primes[i] // pos = pos + dir[dIdx] } printIt(spiral) } fun printIt(spiral:List>){ for(row in spiral){ for (col in row){ print(col.toString().padStart(5, ' ') ) } println() } } //next pos is free to fill fun isValid(l1:List,l2:List,spiral:List>):Boolean{ var v3 = vadd(l1,l2) if ((v3[0] < 0 )or (v3[1] < 0) or (v3[0] > size - 1 )or (v3[1] > size - 1)){ return false } if (spiral[v3[0]][v3[1]] != 0) { return false} return true } // vectorlike addition of position and direction fun vadd(l1:List,l2:List):List{ return listOf(l1[0]+l2[0],l1[1]+l2[1]) }