Compilare: user.cpp: In function ‘void op1(int)’: user.cpp:12:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<H[rest].size(); i++) ^ user.cpp: In function ‘void op2(int)’: user.cpp:23:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<H[rest].size(); i++) ^ user.cpp: In function ‘bool op3(int)’: user.cpp:37:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<H[rest].size(); i++) ^