View Compilation Error

0_0_24720443_454.cpp: In function 'int finde(int)':
0_0_24720443_454.cpp:5:11: error: 'f' was not declared in this scope
     while(f[x]!=x)
           ^
0_0_24720443_454.cpp:7:12: error: 'f' was not declared in this scope
     return f[x]=x;
            ^
0_0_24720443_454.cpp: In function 'void join(int, int)':
0_0_24720443_454.cpp:13:5: error: 'f' was not declared in this scope
     f[b]=a;
     ^
0_0_24720443_454.cpp: At global scope:
0_0_24720443_454.cpp:15:1: error: 'f' does not name a type
 f[1003];
 ^
0_0_24720443_454.cpp: In function 'int main()':
0_0_24720443_454.cpp:23:9: error: 'f' was not declared in this scope
         f[i]=i;
         ^
0_0_24720443_454.cpp:27:12: error: 'f' was not declared in this scope
            f[b]=a;
            ^