init commit

3sem/exam/sem2.c

@@ -0,0 +1,24 @@
+// суть - предсказываем поведение кэша.
+
+#include <stdio.h>
+#include <string.h>
+
+enum
+{
+    CACHE_LEN = 1024,
+    BLOCK_SIZE = 512,
+};
+
+int
+main(void)
+{
+    unsigned addrs[CACHE_LEN];
+    memset(addrs, -1, CACHE_LEN);
+
+    unsigned addr, cnt = 0;
+    while (scanf("%u", &addr) == 1) {
+        int i = (addr / BLOCK_SIZE) % CACHE_LEN;
+        cnt += (addrs[i] != -1) && (addrs[i] != addr);
+        addrs[i] = addr;
+    }
+}