View Compilation Error

0_0_39089163_25008.cpp: In function 'void inis_set(int)':
0_0_39089163_25008.cpp:3:9: error: 's' was not declared in this scope
    3 |         s[i] = i;
      |         ^
0_0_39089163_25008.cpp: In function 'int find_set(int)':
0_0_39089163_25008.cpp:7:17: error: 's' was not declared in this scope
    7 |     return x == s[x] ? x : (find_set(s[x]));        // 即 i 属于s[i]集合
      |                 ^
0_0_39089163_25008.cpp: In function 'void union_set(int, int)':
0_0_39089163_25008.cpp:14:9: error: 's' was not declared in this scope
   14 |         s[y] = s[x];
      |         ^