Compilare: user.cpp: In function ‘void dfs2(int, int)’: user.cpp:23:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int mask = 1; mask < dp[x].size(); mask ++ ) { ^ user.cpp:37:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < lst[x].size(); i ++ ) { ^ user.cpp:40:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int mask = 1; mask < dp[x].size(); mask ++ ) { ^ user.cpp:50:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < lst[x].size(); i ++ ) { ^