0_0_14101242_488.cpp: In function 'int FindSet(int)': 0_0_14101242_488.cpp:15:11: error: 'f' was not declared in this scope if( x == f[x] ) return x; ^ 0_0_14101242_488.cpp:16:9: error: 'f' was not declared in this scope return f[x] = find(f[x]); ^