Compilare: main.cpp: In function 'int main()': main.cpp:87:60: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] int val = trie.find((xxor ^ (1 << (nr_of_bits + 1) - 1))); ~~~~~~~~~~~~~~~~~^~~ main.cpp:88:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(val == 0) ^~ main.cpp:89:30: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' continue; int scor = (sum[val] ^ sum[cnt]); ^~~ main.cpp:75:12: warning: unused variable 'i' [-Wunused-variable] int n, i, cnt = 0; ^