Merge branch 'main' of ssh://github.com/AutoEver-CodingTest/Daily_Code

Author: Hojip-Kim

2025-09-12/추창우/알고스팟_LOAN.cpp

@@ -0,0 +1,49 @@
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+double N, P;
+int M;
+
+// 대출을 갚는 함수
+double balance(double amount, int duration, double rates,
+               double monthlyPayment) {
+  double b = amount;
+  for (int i = 0; i < duration; i++) {
+    b *= 1.0 + (rates / 12) / 100.0;
+    b -= monthlyPayment;
+  }
+
+  return b;
+}
+
+// 이분 탐색
+double payment(double amount, int duration, double rates) {
+  // hi는 이제 한 달에 이자를 값을 상한액 = 월 이자가 포함된 금액
+  double lo = 0, hi = amount * (1.0 + (rates / 12) / 100.0);
+
+  for (int iter = 0; iter < 100; ++iter) {
+    double mid = (lo + hi) / 2.0;
+    if (balance(amount, duration, rates, mid) <= 0) {
+      hi = mid;
+    } else {
+      lo = mid;
+    }
+  }
+
+  return hi;
+}
+
+int main(void) {
+  int cc;
+
+  cin >> cc;
+  for (int c = 0; c < cc; c++) {
+    cin >> N >> M >> P;
+
+    printf("%.12lf\n", payment(N, M, P));
+  }
+
+  return 0;
+}