Compilare: main.cpp: In function 'void operatie_1(int, std::vector<int>&)': main.cpp:10:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < v.size() && ok == 1; i++ ){ ~~^~~~~~~~~~ main.cpp:9:9: warning: unused variable 'i' [-Wunused-variable] int i = 0, ok = 1; ^ main.cpp: In function 'void operatie_2(int, std::vector<int>&)': main.cpp:17:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( i < v.size() && ok == 1 ){ ~~^~~~~~~~~~ main.cpp: In function 'int operatie_3(int, std::vector<int>)': main.cpp:28:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( i < v.size() && ok == 1 ){ ~~^~~~~~~~~~