Atcoder contest exercises

roadmap_atcoder/ABC083B_Some_Sums.cpp

@@ -0,0 +1,29 @@
+#include <bits/stdc++.h>
+
+int digitsSum(int x) {
+
+    int sum = 0;
+
+    while (x != 0) {
+        sum += x%10;
+        x /= 10;
+    }
+
+    return sum;
+
+}
+
+int main(void) {
+
+    int n, a ,b;
+    std::cin >> n >> a >> b;
+
+    int sum = 0;
+
+    for(int i = 1; i <= n; ++i) 
+        if(digitsSum(i) >= a && digitsSum(i) <= b) 
+            sum += i;
+
+    std::cout << sum << std::endl;
+
+}

roadmap_atcoder/ABC087B_Coins.cpp

@@ -0,0 +1,21 @@
+#include <bits/stdc++.h>
+
+int main(void) {
+
+    int a,b,c,x;
+    std::cin >> a >> b >> c >> x;
+    int tot = 0;
+
+    // Analizyng until each coin become zero;
+    for(int i = 0; i <= a; ++i)
+        for(int j = 0; j <= b; ++j)
+            for(int k = 0; k <= c; ++k) {
+                int sum = 500*i + 100*j + 50*k;
+                if(sum == x)
+                    tot++;
+            }
+
+    std::cout << tot << std::endl;
+
+
+}