Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:41:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i < a[x].size(); i++) ~~^~~~~~~~~~~~~ user.cpp: In function ‘void vec(int)’: user.cpp:58:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i < a[x].size(); i++) ~~^~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:85:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i < maxim.size(); i++) ~~^~~~~~~~~~~~~~ user.cpp:94:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i < maxim.size(); i++) ~~^~~~~~~~~~~~~~ user.cpp:104:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i < maxim.size(); i++) ~~^~~~~~~~~~~~~~