Compilare: user.cpp: In function ‘int zero(int, int)’: user.cpp:27:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[l]==C && a[l+1]>C) return l; ^ user.cpp:27:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[l]==C && a[l+1]>C) return l; ^ user.cpp:28:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[r]==C && a[r+1]>C) return r; ^ user.cpp:28:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[r]==C && a[r+1]>C) return r; ^ user.cpp:32:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[y]>C) return zero(l,y); else return zero(y,r); ^ user.cpp: In function ‘int unu(int, int)’: user.cpp:37:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[l]<=C && a[l+1]>C) return l; ^ user.cpp:37:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[l]<=C && a[l+1]>C) return l; ^ user.cpp:38:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[r]<=C && a[r+1]>C) return r; ^ user.cpp:38:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[r]<=C && a[r+1]>C) return r; ^ user.cpp:42:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[y]>C) return unu(l,y); else return unu(y,r); ^ user.cpp: In function ‘int doi(int, int)’: user.cpp:47:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[l]>=C && a[l-1]<C) return l; ^ user.cpp:47:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[l]>=C && a[l-1]<C) return l; ^ user.cpp:48:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[r]>=C && a[r-1]<C) return r; ^ user.cpp:48:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[r]>=C && a[r-1]<C) return r; ^ user.cpp:52:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[y]>=C) return doi(l,y); else return doi(y,r); ^ user.cpp: At global scope: user.cpp:70:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type]