Compilare: main.cpp: In function 'int bsearch(std::vector<int>, int)': main.cpp:12:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[mid]==x && (a[mid+1]!=x || mid+1>a.size()-1)) ~~~~~^~~~~~~~~~~ main.cpp: In function 'int lwr_bound(std::vector<int>, int)': main.cpp:25:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[mid]<=x && (a[mid+1]>x || mid+1>a.size()-1)) return mid+1; ~~~~~^~~~~~~~~~~ main.cpp: In function 'int bsearch(std::vector<int>, int)': main.cpp:20:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int lwr_bound(std::vector<int>, int)': main.cpp:29:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int upp_bound(std::vector<int>, int)': main.cpp:38:1: warning: control reaches end of non-void function [-Wreturn-type] } ^