\uc774 \uae00\uc5d0\uc11c\ub294 \uc790\ubc14 \uc5b8\uc5b4\ub97c \uc774\uc6a9\ud55c \ucf54\ub529 \ud14c\uc2a4\ud2b8 \uc900\ube44 \ubc29\ubc95\uacfc \ud568\uaed8, \uc2e4\uc81c \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \ud480\uc5b4\ubcf4\ub294 \uacfc\uc815\uc744 \ub2e4\ub8e8\uaca0\uc2b5\ub2c8\ub2e4. \uc8fc\uc81c\ub294 ‘\ud0c0\uc784\uba38\uc2e0\uc73c\ub85c \ube68\ub9ac \uac00\uae30’\uc785\ub2c8\ub2e4. \uc774 \ubb38\uc81c\ub97c \ud1b5\ud574 \uadf8\ub798\ud504 \ud0d0\uc0c9 \uae30\ubc95\uacfc \uc54c\uace0\ub9ac\uc998 \ucd5c\uc801\ud654\ub97c \ubc30\uc6b0\uace0, \uc5b4\ub5bb\uac8c \ubb38\uc81c\ub97c \ubd84\uc11d\ud558\uace0 \ud574\uacb0\ud558\ub294\uc9c0 \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n
\ud0c0\uc784\uba38\uc2e0\uc744 \ud0c0\uace0 \uacfc\uac70\uc640 \ubbf8\ub798\ub97c \uc624\uac08 \uc218 \uc788\ub294 \uc5ec\ud589\uc744 \ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4. \ud0c0\uc784\uba38\uc2e0\uc740 \ub2e4\uc74c\uacfc \uac19\uc740 \uc870\uac74\uc5d0\uc11c \uacfc\uac70\ub85c \uac08 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n
\ub2f9\uc2e0\uc758 \ubaa9\ud45c\ub294 Z\ucd08 \ud6c4\uc5d0 X\uc88c\ud45c\uc5d0 \ub3c4\ucc29\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \ud0c0\uc784\uba38\uc2e0\uc744 \uc0ac\uc6a9\ud558\ub294 \ucd5c\uc18c \uc2dc\uac04\uc744 \uad6c\ud558\uc138\uc694.<\/p>\n
\uc815\uc218 X, Z (-10^6 \u2264 X \u2264 10^6, 0 \u2264 Z \u2264 10^6)<\/code><\/pre>\n\ucd9c\ub825 \ud615\uc2dd<\/h3>\n\ud0c0\uc784\uba38\uc2e0\uc744 \uc0ac\uc6a9\ud558\ub294 \ucd5c\uc18c \uc2dc\uac04. \ubd88\uac00\ub2a5\ud560 \uacbd\uc6b0 -1\uc744 \ucd9c\ub825<\/code><\/pre>\n\uc608\uc2dc<\/h2>\n\n\uc785\ub825:<\/strong> 5 7<\/code>
\n\ucd9c\ub825:<\/strong> 7<\/code>\n<\/div>\n\n\uc785\ub825:<\/strong> 2 5<\/code>
\n\ucd9c\ub825:<\/strong> -1<\/code>\n<\/div>\n\ubb38\uc81c \ud480\uc774 \uacfc\uc815<\/h2>\n
\uc774 \ubb38\uc81c\ub97c \ud480\uae30 \uc704\ud574\uc11c\ub294 \ubaa9\ud45c\ud558\ub294 \uc704\uce58 X\uc5d0 \ub3c4\ub2ec\ud558\uae30 \uc704\ud574 \ud0c0\uc784\uba38\uc2e0\uc758 \uc0ac\uc6a9 \uc870\uac74\uc744 \uc774\ud574\ud558\uace0, \uc774\ub97c \uae30\ubc18\uc73c\ub85c BFS(\ub108\ube44 \uc6b0\uc120 \ud0d0\uc0c9) \uc54c\uace0\ub9ac\uc998\uc744 \uc801\uc6a9\ud558\ub294 \uac83\uc774 \ud6a8\uacfc\uc801\uc785\ub2c8\ub2e4. BFS\ub294 \uc8fc\uc5b4\uc9c4 \uc870\uac74\uc5d0\uc11c \ucd5c\ub2e8 \uacbd\ub85c\ub97c \ucc3e\ub294 \ub370 \uc720\ub9ac\ud55c \uc54c\uace0\ub9ac\uc998\uc785\ub2c8\ub2e4.<\/p>\n
1\ub2e8\uacc4: \uc0c1\ud0dc \uc815\uc758<\/h3>\n
\ud0c0\uc785\uba38\uc2e0\uc758 \uac01\uac01\uc758 \uc0c1\ud0dc\ub97c \ud45c\ud604\ud558\uae30 \uc704\ud574 \ud604\uc7ac \uc704\uce58<\/code>\uc640 \uacbd\uacfc \uc2dc\uac04<\/code>\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4.<\/p>\n2\ub2e8\uacc4: \uc774\ub3d9 \uaddc\uce59 \uc815\uc758<\/h3>\n\n- \ud55c \uce78 \uc55e\uc73c\ub85c \uc774\ub3d9:
\ud604\uc7ac \uc704\uce58 + 1<\/code><\/li>\n- \ud55c \uce78 \ub4a4\ub85c \uc774\ub3d9:
\ud604\uc7ac \uc704\uce58 - 1<\/code><\/li>\n<\/ul>\n3\ub2e8\uacc4: BFS \uad6c\ud604<\/h3>\nimport java.util.*;\n\npublic class TimeMachine {\n public static void main(String[] args) {\n Scanner sc = new Scanner(System.in);\n int X = sc.nextInt();\n int Z = sc.nextInt();\n System.out.println(minimumTime(X, Z));\n }\n \n public static int minimumTime(int target, int z) {\n Queue queue = new LinkedList<>();\n Set visited = new HashSet<>();\n queue.add(new int[]{0, 0}); \/\/ {\ud604\uc7ac \uc704\uce58, \uacbd\uacfc \uc2dc\uac04}\n \n while (!queue.isEmpty()) {\n int[] current = queue.poll();\n int position = current[0];\n int time = current[1];\n\n if (time > z) continue; \/\/ Z \ucd08\uac00 \ub118\uc5b4\uac00\uba74 \ubb34\uc2dc\n if (position == target && time == z) return time;\n\n \/\/ \ud55c \uce78 \uc55e\uc73c\ub85c \uc774\ub3d9\n if (!visited.contains(position + 1)) {\n queue.add(new int[]{position + 1, time + 1});\n visited.add(position + 1);\n }\n\n \/\/ \ud55c \uce78 \ub4a4\ub85c \uc774\ub3d9\n if (!visited.contains(position - 1)) {\n queue.add(new int[]{position - 1, time + 2});\n visited.add(position - 1);\n }\n }\n return -1;\n }\n}<\/integer><\/int[]><\/code><\/pre>\n4\ub2e8\uacc4: \ud14c\uc2a4\ud2b8 \ubc0f \ucd5c\uc801\ud654<\/h3>\n
\uc704 \ucf54\ub4dc\ub97c \uc791\uc131\ud55c \ud6c4 \ub2e4\uc591\ud55c \uc785\ub825\uac12\uc744 \ub123\uc5b4 \ud14c\uc2a4\ud2b8\ud574 \ubcf4\uc138\uc694. \ubd88\uac00\ub2a5\ud55c \uacbd\uc6b0\ub3c4 \uc798 \ucc98\ub9ac\ud558\ub294\uc9c0 \ud655\uc778\ud574\uc57c \ud569\ub2c8\ub2e4. \ub610\ud55c, \uba54\ubaa8\ub9ac \uc0ac\uc6a9\ub7c9\uc774\ub098 \uc2e4\ud589 \uc2dc\uac04\uc744 \ucd5c\uc801\ud654\ud558\ub294 \ubc29\ubc95\ub3c4 \uace0\ubbfc\ud574 \ubcf4\uc2ed\uc2dc\uc624.<\/p>\n
\ub9c8\ubb34\ub9ac<\/h2>\n
\uc774\ubc88 \uac15\uc88c\uc5d0\uc11c\ub294 \uc790\ubc14\ub97c \uc774\uc6a9\ud558\uc5ec \uc54c\uace0\ub9ac\uc998 \ubb38\uc81c\ub97c \uc2ac\uae30\ub86d\uac8c \ud574\uacb0\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf4\uc558\uc2b5\ub2c8\ub2e4. ‘\ud0c0\uc784\uba38\uc2e0\uc73c\ub85c \ube68\ub9ac \uac00\uae30’ \ubb38\uc81c\ub97c \ud1b5\ud574 BFS \uc54c\uace0\ub9ac\uc998\uc758 \uae30\ucd08\uc640 \uc0c1\ud0dc \uacf5\uac04 \ud0d0\uc0c9\uc758 \ud6a8\uacfc\uc131\uc744 \uacbd\ud5d8\ud588\uc2b5\ub2c8\ub2e4. \uc9c0\uc18d\uc801\uc73c\ub85c \ub2e4\uc591\ud55c \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uba70 \uc2e4\ub825\uc744 \uc313\uc544\uac00\uae38 \ubc14\ub78d\ub2c8\ub2e4.<\/p>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"