Compilare: main.cpp: In function 'int cautare(int)': main.cpp:14:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < a[key].size(); j++) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int inserare(int)': main.cpp:28:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int stergere(int)': main.cpp:33:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < a[key].size(); j++) ~~^~~~~~~~~~~~~~~ main.cpp:38:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^