Compilare: user.cpp: In function ‘int fmax(int, int, int)’: user.cpp:11:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[M]==v && (a[M+1]!=v || M+1==n))return M; ^ user.cpp:11:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[M]==v && (a[M+1]!=v || M+1==n))return M; ^ user.cpp:13:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[M]>v)return fmax(v,l,M); ^ user.cpp: In function ‘int pmax(int, int, int)’: user.cpp:18:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[M]<=v && (a[M+1]>v || M+1==n ))return M; ^ user.cpp:18:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[M]<=v && (a[M+1]>v || M+1==n ))return M; ^ user.cpp:19:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[M]>v)return pmax(v,l,M); ^ user.cpp: In function ‘int pmin(int, int, int)’: user.cpp:24:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[M]>=v && (a[M-1]<v || M-1==0 ))return M; ^ user.cpp:24:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[M]>=v && (a[M-1]<v || M-1==0 ))return M; ^ user.cpp:25:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[M]>=v)return pmin(v,l,M); ^ user.cpp: At global scope: user.cpp:29:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main(){ ^