Compilare: user.cpp: In function ‘int main()’: user.cpp:59:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<a.size();i++) ^ user.cpp:94:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size();i++) ^ user.cpp:91:24: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] j--; ^