some programs!!

cs101/dh_03_03.cpp

@@ -0,0 +1,31 @@
+#include <iostream>
+#include <cmath>
+
+int get_digit(int num, int digit) {
+    num /= static_cast<int>(std::pow(10, digit));
+    // std::clog << num << " is " << digit << "->" << std::endl;
+    return num % 10;
+}
+
+bool is_good_num(int num) {
+    return get_digit(num, 0)
+        - (get_digit(num, 3) + get_digit(num, 2) + get_digit(num, 1))
+        > 0;
+}
+
+int n, ans;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    std::cin >> n;
+    for (int _ = 0; _ < n; _++) {
+        int num;
+        std::cin >> num;
+        ans += is_good_num(num);
+    }
+    std::cout << ans << std::endl;
+
+    return 0;
+}