Compilare: main.cpp: In function 'int main()': main.cpp:20:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(j=0; j<my_hash[clasa].size(); j++) | ~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:20:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation] 20 | for(j=0; j<my_hash[clasa].size(); j++) | ^~~ main.cpp:26:13: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for' 26 | if(operatie==1) | ^~