stack = new Stack<>();\n for (char c : s.toCharArray()) {\n if (c == '(' || c == '{' || c == '[') {\n stack.push(c);\n } else {\n if (stack.isEmpty()) return false;\n char top = stack.pop();\n if ((c == ')' && top != '(') || \n (c == '}' && top != '{') || \n (c == ']' && top != '[')) {\n return false;\n }\n }\n }\n return stack.isEmpty();\n }\n\n public static void main(String[] args) {\n System.out.println(isValid(\"()\")); \/\/ true\n System.out.println(isValid(\"()[]{}\")); \/\/ true\n System.out.println(isValid(\"{[()]}\")); \/\/ true\n System.out.println(isValid(\"(]\")); \/\/ false\n System.out.println(isValid(\"([)]\")); \/\/ false\n System.out.println(isValid(\"{)\")); \/\/ false\n }\n }\n <\/character><\/code>\n <\/pre>\n\uc2dc\uac04 \ubcf5\uc7a1\ub3c4<\/h3>\n
\n \uc774 \uc54c\uace0\ub9ac\uc998\uc758 \uc2dc\uac04 \ubcf5\uc7a1\ub3c4\ub294 O(n)\uc785\ub2c8\ub2e4.
\n n\uc740 \ubb38\uc790\uc5f4\uc758 \uae38\uc774\uc785\ub2c8\ub2e4. \uc2a4\ud0dd\uc744 \uc0ac\uc6a9\ud558\ub294 \ub9cc\ud07c \ucd5c\uc545\uc758 \uacbd\uc6b0 \uc5f4\ub9b0 \uad04\ud638\uac00 n\uac1c \uc788\uc744 \ub54c n\ubc88\uc758 push\uc640 n\ubc88\uc758 pop \uc5f0\uc0b0\uc774 \uc774\ub8e8\uc5b4\uc9c8 \uc218 \uc788\uc2b5\ub2c8\ub2e4.\n <\/p>\n
\uacf5\uac04 \ubcf5\uc7a1\ub3c4<\/h3>\n
\n \uacf5\uac04 \ubcf5\uc7a1\ub3c4 \ub610\ud55c O(n)\uc785\ub2c8\ub2e4.
\n \uc2a4\ud0dd\uc5d0 \ucd5c\ub300 n\uac1c\uc758 \uc5f4\ub9b0 \uad04\ud638\uac00 \ub4e4\uc5b4\uac08 \uc218 \uc788\uc73c\ubbc0\ub85c \ucd5c\uc545\uc758 \uacbd\uc6b0 \uacf5\uac04 \ubcf5\uc7a1\ub3c4\ub294 O(n)\uc785\ub2c8\ub2e4.\n <\/p>\n
\ubb38\uc81c \ud480\uc774 \uacfc\uc815 \uc694\uc57d<\/h2>\n
\n \ubcf8 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud574 \uc2a4\ud0dd\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc5f4\ub9b0 \uad04\ud638\ub97c \ucd94\uc801\ud558\uace0, \ub2eb\ud78c \uad04\ud638\uac00 \ub098\uc62c \ub54c\ub9c8\ub2e4 \uc2a4\ud0dd\uc5d0\uc11c pop\ud558\uc5ec \uac80\uc0ac\ud558\ub294 \ubc29\ubc95\uc744 \uc0ac\uc6a9\ud588\uc2b5\ub2c8\ub2e4.
\n \uc774\ub7ec\ud55c \ubc29\ubc95\uc740 \uad04\ud638\uc758 \uc720\ud6a8\uc131\uc744 \uac80\uc0ac\ud558\ub294 \ub370 \uc788\uc5b4 \ub9e4\uc6b0 \ud6a8\uc728\uc801\uc774\uba70, \ub2e4\ub978 \uad04\ud638\uc5d0 \ub300\ud55c \uc720\ud6a8\uc131 \uac80\uc0ac\uc5d0\ub3c4 \ub3d9\uc77c\ud55c \uc6d0\ub9ac\ub97c \uc801\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.\n <\/p>\n
\uc720\ud6a8\ud55c \ucf54\ub529 \ud14c\uc2a4\ud2b8\ub97c \uc704\ud55c \ud301<\/h3>\n
\n \ucf54\ub529 \ud14c\uc2a4\ud2b8\uc5d0\uc11c \uc2a4\ud0dd\uacfc \ud050\ub294 \uc790\uc8fc \ud65c\uc6a9\ub418\ub294 \uc790\ub8cc\uad6c\uc870\uc785\ub2c8\ub2e4.
\n \ub2e4\uc591\ud55c \ubb38\uc81c\ub97c \ud1b5\ud574 \uc2a4\ud0dd\uacfc \ud050\uc758 \ud65c\uc6a9 \ubc29\ubc95\uacfc \uadf8 \ub9ac\ub4ec\uc5d0 \uc775\uc219\ud574\uc9c0\ub294 \uac83\uc774 \uc911\uc694\ud569\ub2c8\ub2e4.
\n \uc790\uc8fc \ub4f1\uc7a5\ud558\ub294 \ud328\ud134\uacfc \ud2b8\ub9ad\uc744 \uc775\ud788\uace0, \ub2e4\uc591\ud55c \ubcc0\ud615 \ubb38\uc81c\ub97c \uc5f0\uc2b5\ud558\uc5ec \ubb38\uc81c \ud574\uacb0 \ub2a5\ub825\uc744 \ud0a4\uc6b0\uc138\uc694.\n <\/p>\n