diff --git a/code_study/Baekjoon/js/1316.js b/code_study/Baekjoon/js/1316.js
new file mode 100644
index 0000000..23785a5
--- /dev/null
+++ b/code_study/Baekjoon/js/1316.js
@@ -0,0 +1,9 @@
+const n = require("fs").readFileSync(0,"utf8").toString().trim().split("\n");
+let cnt = 0;
+
+for(let i=1; i<=Number(n[0]); i++){
+    const s = n[i].replace(/(.)\1+/g, "$1");
+    if(new Set(s).size === s.length) cnt++;
+}
+
+console.log(cnt);
diff --git a/code_study/Baekjoon/js/25206.js b/code_study/Baekjoon/js/25206.js
new file mode 100644
index 0000000..3edb64c
--- /dev/null
+++ b/code_study/Baekjoon/js/25206.js
@@ -0,0 +1,19 @@
+const n = require("fs").readFileSync(0,"utf8").toString().split("\n");
+let grade = {
+    "A+": 4.5, "A0": 4.0,
+    "B+": 3.5, "B0": 3.0,
+    "C+": 2.5, "C0": 2.0,
+    "D+": 1.5, "D0": 1.0,
+    "F": 0.0
+}
+let sum_credit=0, sum_rate=0;
+
+for(let i=0; i<20; i++){
+    let [sub, credit, rate] = n[i].split(" ");
+    credit = parseFloat(credit);
+    if(rate==='P') continue;
+    sum_credit += credit;
+    sum_rate += credit * grade[rate];
+}
+
+console.log((sum_rate/sum_credit).toFixed(6));
diff --git a/code_study/Baekjoon/js/2941.js b/code_study/Baekjoon/js/2941.js
new file mode 100644
index 0000000..03c7e66
--- /dev/null
+++ b/code_study/Baekjoon/js/2941.js
@@ -0,0 +1,2 @@
+const s = require("fs").readFileSync(0,"utf8").toString().trim();
+console.log(s.replace(/c=|c-|dz=|d-|lj|nj|s=|z=/g,'*').length);
\ No newline at end of file