Long time no see

1Y-2H/dsa/snippet.c

@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/time.h>
+
+double wtime();
+int getrand(int min, int max);
+void fill_rand(int *arr, int n);
+
+int main(void){
+    int sn = 50000;
+    int en = 1000000;
+    int step = 50000;    
+    srand(123);
+
+    FILE *f = fopen("res.dat", "w");
+
+
+}
+
+
+double wtime() {
+    struct timeval t;
+    gettimeofday(&t, NULL);
+    return (double)t.tv_sec + (double)t.tv_usec * 1E-6;
+}
+
+int getrand(int min, int max) {
+    return (double)rand() / (RAND_MAX + 1.0) * (max - min) + min;
+}
+
+void fill_rand(int *arr, int n) {
+    for (int i = 0; i < n; i++)
+        arr[i] = getrand(1, 1000001);
+}