Compilare: main.cpp: In function 'int main()': main.cpp:39:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0 ; j < hash_table[i].size() ; ++j) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:38:1: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for (int i = 0 ; i < MOD ; ++i) ^~~ main.cpp:42:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' return 0; ^~~~~~