Compilare: main.cpp: In function 'int nr_elem(int)': main.cpp:11:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++) ~^~~ main.cpp:12:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {while(j>=1&&v[i]+v[j]>x) j--; ~~~~~~~~~^~ main.cpp: In function 'int main()': main.cpp:21:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++) ~^~~ main.cpp:27:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nr_elem(mij)>=k){y=mij; continue;} ~~~~~~~~~~~~^~~