Compilare: main.cpp: In function 'int bsearch(std::vector<int>, int)': main.cpp:13:47: 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:27:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[mid]<=x && (mid+1>a.size()-1 || a[mid+1]>x)) ~~~~~^~~~~~~~~~~ main.cpp: In function 'int bsearch(std::vector<int>, int)': main.cpp:22:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int lwr_bound(std::vector<int>, int)': main.cpp:33:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int upp_bound(std::vector<int>, int)': main.cpp:43:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int bsearch(std::vector<int>, int)': main.cpp:9:9: warning: 'mid' may be used uninitialized in this function [-Wmaybe-uninitialized] int mid; ^~~