0_0_25596533_15390.cpp: In function 'int find(int)': 0_0_25596533_15390.cpp:12:14: error: 'pre' was not declared in this scope while (r != pre[r]) ^ 0_0_25596533_15390.cpp:20:7: error: 'pre' was not declared in this scope j = pre[i]; ^