init commit

3sem/cnts/contest7/01.c

@@ -0,0 +1,90 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <linux/limits.h>
+#include <stdint.h>
+#include <string.h>
+#include <ctype.h>
+
+int
+main(int argc, char *argv[])
+{
+    const char const_str[] = "18446744073709551616";
+    int ch, index = 0;
+    int64_t res = 0;
+    int is_overflow = 0;
+
+    while ((ch = getchar()) != EOF) {
+        if (!isspace(ch)) {
+            index = 1;
+            int64_t tmp = 0;
+            if (ch == 'a') {
+                if (res > 0) {
+                    if (__builtin_mul_overflow(res - 1, 3, &tmp)) {
+                        is_overflow = 1;
+                    }
+                    if (__builtin_sub_overflow(tmp, 1, &res)) {
+                        is_overflow = 1;
+                    }
+                    if (__builtin_add_overflow(res, 3, &tmp)) {
+                        is_overflow = 1;
+                    }
+                    res = tmp;
+                } else {
+                    if (__builtin_mul_overflow(res, 3, &tmp)) {
+                        is_overflow = 1;
+                    }
+                    if (__builtin_sub_overflow(tmp, 1, &res)) {
+                        is_overflow = 1;
+                    }
+                }
+
+            } else if (ch == '1') {
+                if (res > 0) {
+                    if (__builtin_mul_overflow(res, 3, &tmp)) {
+                        is_overflow = 1;
+                    }
+                    if (__builtin_add_overflow(tmp, 1, &res)) {
+                        is_overflow = 1;
+                    }
+                } else {
+                    if (__builtin_mul_overflow(res + 1, 3, &tmp)) {
+                        is_overflow = 1;
+                    }
+                    if (__builtin_add_overflow(tmp, 1, &res)) {
+                        is_overflow = 1;
+                    }
+                    if (__builtin_sub_overflow(res, 3, &tmp)) {
+                        is_overflow = 1;
+                    }
+                    res = tmp;
+                }
+            } else if (ch == '0') {
+                if (__builtin_mul_overflow(res, 3, &res)) {
+                    is_overflow = 1;
+                }
+            }
+        } else {
+            if (index) {
+                if (is_overflow) {
+                    printf("%s\n", const_str);
+                } else {
+                    printf("%lld\n", res);
+                }
+
+                index = 0;
+                res = 0;
+                is_overflow = 0;
+            }
+        }
+    }
+
+    if (index) {
+        if (is_overflow) {
+            printf("%s\n", const_str);
+        } else {
+            printf("%lld\n", res);
+        }
+    }
+
+    return 0;
+}