Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:23:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[x].size(); ++i) ^ user.cpp:27:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[x].size(); ++i) ^ user.cpp:30:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= son.size(); ++i) ^ user.cpp:31:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j <= son.size(); ++j) ^ user.cpp:35:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= son.size(); ++i) ^ user.cpp:36:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; i + j <= son.size(); ++j){ ^ user.cpp:43:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(r < son.size()) ^ user.cpp:45:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(r < son.size() && l > 1) ^ user.cpp:53:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[x].size(); ++i) ^ user.cpp:57:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= son.size(); ++i) ^ user.cpp:58:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j <= son.size(); ++j) ^ user.cpp:61:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= son.size(); ++i) ^ user.cpp:62:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; i + j <= son.size(); ++j){ ^ user.cpp:69:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(r < son.size()) ^ user.cpp:71:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(r < son.size() && l > 1) ^