0401

0401/1.c

@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+void f(){
+    printf("Welcome to Beijing!\n");
+}
+
+int main() {
+    f();
+    return 0;
+}

0401/2.c

@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+void f(){
+    printf("0 1 2 3 4 5 6 7 8 9 10\n");
+}
+
+int main() {
+    f();
+    return 0;
+}

0401/3.c

@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+void f(int a, int b) { printf("%d", a * b); }
+
+int main() {
+    int a, b;
+    scanf("%d %d", &a, &b);
+    f(a, b);
+    return 0;
+}

0401/4.c

@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+void f(int a) { printf("%d", a - 1); }
+
+int main() {
+    int a;
+    scanf("%d", &a);
+    f(a);
+    return 0;
+}

0401/5.c

@@ -0,0 +1,11 @@
+#include <math.h>
+#include <stdio.h>
+
+float f(int a, int b) { return sqrt(a * a + b * b); }
+
+int main() {
+    int a, b;
+    scanf("%d %d", &a, &b);
+    printf("%.2f", f(a, b));
+    return 0;
+}

0401/6.c

@@ -0,0 +1,11 @@
+#include <math.h>
+#include <stdio.h>
+
+float f(int a, int b) { return sqrt(a * a + b * b); }
+
+int main() {
+    int a, b, c, d;
+    scanf("%d %d %d %d", &a, &b, &c, &d);
+    printf("%.2f", f(a - c, b - d));
+    return 0;
+}

0401/7.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+#define for_i(i, range, inner)                                                 \
+    {                                                                          \
+        int i;                                                                 \
+        for (i = 0; i < range; i++)                                            \
+            inner;                                                             \
+    }
+
+void f(int a[], int len){
+    for_i(i, len, a[i]=-a[i]);
+}
+
+int main() {
+    int n, a[1005];
+    scanf("%d", &n);
+    for_i(i, n, scanf("%d", &a[i]));
+    f(a, n);
+    for_i(i, n, printf("%d ", a[i]));
+    return 0;
+}