🐜 Study: 성적 평균

Author: ing-eoking

ing-eoking/성적 평균.js

@@ -0,0 +1,10 @@
+const fs = require('fs');
+const input = fs.readFileSync("/dev/stdin").toString().trim().split('\n');
+
+let [_, scores, ...arr] = input;
+let sum = 0, score = [sum, ...scores.split(' ').map(value => sum += +value)];
+
+arr.forEach(item => {
+    let [st, ed] = item.split(' ').map(value => +value);
+    console.log(((score[ed] - score[st - 1]) / (ed - st + 1)).toFixed(2));
+})