Compilare: user.cpp: In function ‘void opt0(int)’: user.cpp:19:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[mij]==val) ^ user.cpp:27:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[mij+1]!=val) ^ user.cpp:37:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (val < v[mij]) ^ user.cpp: In function ‘void opt1(int)’: user.cpp:53:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[mij]==val) ^ user.cpp:61:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[mij+1]!=val) ^ user.cpp:71:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[mij]< val && v[mij+1] > val) ^ user.cpp:71:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[mij]< val && v[mij+1] > val) ^ user.cpp:76:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (val < v[mij]) ^ user.cpp: In function ‘void opt2(int)’: user.cpp:92:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[mij]==val) ^ user.cpp:100:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[mij-1]!=val) ^ user.cpp:110:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[mij] < val && v[mij-1] > val) ^ user.cpp:110:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[mij] < val && v[mij-1] > val) ^ user.cpp:115:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (val < v[mij]) ^