diff --git a/include/solution/1717.h b/include/solution/1717.h
new file mode 100644
index 0000000..c0dc2da
--- /dev/null
+++ b/include/solution/1717.h
@@ -0,0 +1,11 @@
+#ifndef INC_1717_H
+#define INC_1717_H
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+    int maximumGain(char *s, int x, int y);
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/src/1717.c b/src/1717.c
new file mode 100644
index 0000000..df17b03
--- /dev/null
+++ b/src/1717.c
@@ -0,0 +1,91 @@
+#include <solution/1717.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct
+{
+    char *base;
+    size_t size;
+    size_t top;
+} stack_t;
+
+void init_stack(stack_t *s)
+{
+    s->base = malloc(sizeof(char) * 10);
+    s->size = 10;
+    s->top = 0;
+}
+
+void push(stack_t *s, char c)
+{
+    if (s->top + 1 >= s->size)
+    {
+        s->size += 10;
+        s->base = realloc(s->base, sizeof(char) * s->size);
+    }
+    s->base[++(s->top)] = c;
+}
+
+char pop(stack_t *s)
+{
+    if (s->top == 0)
+        return '\0';
+    return s->base[(s->top)--];
+}
+
+void clear(stack_t *s)
+{
+    s->top = 0;
+}
+
+char top(stack_t *s)
+{
+    return s->base[s->top];
+}
+
+char *sts(stack_t *s)
+{
+    char *ret = malloc(sizeof(char) * (s->top + 1));
+
+    memcpy(ret, s->base + 1, s->top);
+    ret[s->top] = '\0';
+
+    return ret;
+}
+
+void delete_stack(stack_t *s)
+{
+    free(s->base);
+}
+
+char *del(char *s, char m1, char m2, int *score, int v)
+{
+    stack_t st;
+    init_stack(&st);
+    while (*s)
+    {
+        if (top(&st) == m1 && *s == m2)
+        {
+            s += 1, *score += v;
+            pop(&st);
+        }
+        else
+            push(&st, *(s++));
+    }
+
+    char *r = sts(&st);
+    delete_stack(&st);
+    return r;
+}
+
+int maximumGain(char *s, int x, int y)
+{
+    int score = 0;
+    if (x > y)
+        del(del(s, 'a', 'b', &score, x), 'b', 'a', &score, y);
+    else
+        del(del(s, 'b', 'a', &score, y), 'a', 'b', &score, x);
+
+    return score;
+}
\ No newline at end of file
diff --git a/tests/test_1717.cpp b/tests/test_1717.cpp
new file mode 100644
index 0000000..857e112
--- /dev/null
+++ b/tests/test_1717.cpp
@@ -0,0 +1,30 @@
+#include <gtest/gtest.h>
+#include <solution/1717.h>
+
+class MaximumGainTest : public ::testing::Test
+{
+  protected:
+    void AssertMaximumGain(const std::string &input, int x, int y, int expected)
+    {
+        char *s = strdup(input.c_str()); // 复制字符串，防止修改原始数据
+        int result = maximumGain(s, x, y);
+        ASSERT_EQ(result, expected);
+        free(s);
+    }
+};
+
+// 示例 1
+TEST_F(MaximumGainTest, Example1)
+{
+    // 输入：s = "cdbcbbaaabab", x = 4, y = 5
+    // 输出：19
+    AssertMaximumGain("cdbcbbaaabab", 4, 5, 19);
+}
+
+// 示例 2
+TEST_F(MaximumGainTest, Example2)
+{
+    // 输入：s = "aabbaaxybbaabb", x = 5, y = 4
+    // 输出：20
+    AssertMaximumGain("aabbaaxybbaabb", 5, 4, 20);
+}
\ No newline at end of file