Compilare: user.cpp: In function ‘void solve2()’: user.cpp:47:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < sol.size() ; i++ ) ~~^~~~~~~~~~~~ user.cpp:58:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < sol.size() ; i++ ) ~~^~~~~~~~~~~~ user.cpp:67:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < sol.size() ; i++ ) ~~^~~~~~~~~~~~ user.cpp:30:25: warning: unused variable ‘ct’ [-Wunused-variable] int i , j , k , nr ,ct,s=0,rep; ^~ user.cpp:41:7: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] k = j-2; ~~^~~~~