boj step 11 rework

zeta_C/completed/24263.c

@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main() {
+    int n;
+    scanf("%d", &n);
+    printf("%d\n%d\n", n, 1);
+
+    return 0;
+}

zeta_C/completed/24264.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    long long n;
+    scanf("%lld", &n);
+    printf("%lld\n%d\n", n * n, 2);
+    return 0;
+}

zeta_C/completed/24265.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    long long n;
+    scanf("%lld", &n);
+    printf("%lld\n%d\n", n * (n - 1L) / 2L, 2);
+    return 0;
+}

zeta_C/completed/24266.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    long long n;
+    scanf("%lld", &n);
+    printf("%lld\n%d\n", n * n * n, 3);
+    return 0;
+}

zeta_C/completed/24267.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    long long n;
+    scanf("%lld", &n);
+    printf("%lld\n%d\n", n * (n - 1L) * (n - 2L) / 6L, 3);
+    return 0;
+}

zeta_C/completed/24313.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+int main() {
+    int a1, a0, c, n0;
+    scanf("%d %d\n%d\n%d", &a1, &a0, &c, &n0);
+
+    int cond = 1;
+
+    for (int i = n0; i <= 100; i++) {
+        if (a1 * i + a0 > c * i) {
+            cond = 0;
+            break;
+        }
+    }
+
+    printf("%d\n", cond);
+    return 0;
+}