diff --git a/solutions/beecrowd/1099/1099.c b/solutions/beecrowd/1099/1099.c
new file mode 100644
index 00000000..eeb6882c
--- /dev/null
+++ b/solutions/beecrowd/1099/1099.c
@@ -0,0 +1,34 @@
+#include <stdint.h>
+#include <stdio.h>
+
+int main() {
+    int32_t n, i, f, x, j, s;
+
+    scanf("%d", &n);
+
+    while (n--) {
+        s = 0;
+
+        scanf("%d %d", &i, &f);
+
+        if (i > f) {
+            x = i;
+            i = f;
+            f = x;
+        }
+
+        i++;
+
+        if (i % 2 == 0) {
+            i++;
+        }
+
+        for (j = i; j < f; j += 2) {
+            s += j;
+        }
+
+        printf("%d\n", s);
+    }
+
+    return 0;
+}