Compilare: user.cpp: In function ‘int cautbin(int, int, int, int)’: user.cpp:11:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[st]==x) return st; ^ user.cpp:10:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] { if(st==dr) ^ user.cpp:14:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x==a[mid]) ^ user.cpp:16:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[mid+1]!=x) return mid; ^ user.cpp:20:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x<a[mid]) return cautbin(st,mid-1,0,x); ^ user.cpp:21:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x>a[mid]) return cautbin(mid+1,dr,0,x); ^ user.cpp:26:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x<=a[mid]) ^ user.cpp:28:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x==a[mid]) if(a[mid+1]>x) return mid; else return cautbin(mid+1,dr,1,x); ^ user.cpp:28:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x==a[mid]) if(a[mid+1]>x) return mid; else return cautbin(mid+1,dr,1,x); ^ user.cpp:39:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x>=a[mid]){ ^ user.cpp:40:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x==a[mid]) if(a[mid-1]<x) return mid; else return cautbin(st,mid-1,2,x); ^ user.cpp:40:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x==a[mid]) if(a[mid-1]<x) return mid; else return cautbin(st,mid-1,2,x); ^ user.cpp:40:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(x==a[mid]) if(a[mid-1]<x) return mid; else return cautbin(st,mid-1,2,x); ^ user.cpp:41:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x>a[mid]) return cautbin(mid+1,dr,2,x); ^ user.cpp: In function ‘int main()’: user.cpp:50:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++)in>>a[i]; ^ user.cpp:52:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=m;i++) ^