init commit

3sem/cnts/contest7/01-test.c

@@ -0,0 +1,98 @@
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+enum
+{
+    MAX_SYM_THREE_LEN = 64,
+    SYS_BASE = 3,
+};
+
+const char ERROR_OUTPUT[] = "18446744073709551616";
+
+int
+main(void)
+{
+    int cur_num = getchar();
+    while (cur_num != EOF && isspace(cur_num)) {
+        cur_num = getchar();
+    }
+    long long res = 0;
+    bool overflow = false;
+    bool printed = false;
+    bool read = false;
+    while (cur_num != EOF) {
+        char cur_ch = cur_num;
+        if (isspace(cur_num)) {
+            if (!printed) {
+                if (overflow) {
+                    printf("%s\n", ERROR_OUTPUT);
+                } else {
+                    printf("%lld\n", res);
+                }
+                res = 0;
+                overflow = false;
+                printed = true;
+            }
+        } else {
+            read = true;
+            printed = false;
+            if (cur_ch == '1') {
+                long long temp = 0;
+                if (res < 0) {
+                    if (__builtin_mul_overflow(res + 1, 3, &temp)) {
+                        overflow = true;
+                    }
+                    if (__builtin_add_overflow(temp, 1, &res)) {
+                        overflow = true;
+                    }
+                    if (__builtin_sub_overflow(res, 3, &temp)) {
+                        overflow = true;
+                    }
+                    res = temp;
+                } else {
+                    if (__builtin_mul_overflow(res, 3, &temp)) {
+                        overflow = true;
+                    }
+                    if (__builtin_add_overflow(temp, 1, &res)) {
+                        overflow = true;
+                    }
+                }
+
+            } else if (cur_ch == 'a') {
+                long long temp = 0;
+                if (res > 0) {
+                    if (__builtin_mul_overflow(res - 1, 3, &temp)) {
+                        overflow = true;
+                    }
+                    if (__builtin_sub_overflow(temp, 1, &res)) {
+                        overflow = true;
+                    }
+                    if (__builtin_add_overflow(res, 3, &temp)) {
+                        overflow = true;
+                    }
+                    res = temp;
+                } else {
+                    if (__builtin_mul_overflow(res, 3, &temp)) {
+                        overflow = true;
+                    }
+                    if (__builtin_sub_overflow(temp, 1, &res)) {
+                        overflow = true;
+                    }
+                }
+            } else if (cur_ch == '0') {
+                long long temp = 0;
+                if (__builtin_mul_overflow(res, 3, &temp)) {
+                    overflow = true;
+                }
+                res = temp;
+            }
+        }
+        cur_num = getchar();
+    }
+    if (cur_num == EOF && !printed && !overflow && read) {
+        printf("%lld\n", res);
+    }
+}