Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:35:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[x].size(); i++){ ~^~~~~~~~~~~~ user.cpp:37:13: warning: unused variable ‘sum’ [-Wunused-variable] int sum = 0; ^~~ user.cpp: In function ‘void vec(int)’: user.cpp:49:21: 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:71:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i < maxim.size(); i++) ~~^~~~~~~~~~~~~~ user.cpp:80:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i < maxim.size(); i++) ~~^~~~~~~~~~~~~~ user.cpp:90:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i < maxim.size(); i++) ~~^~~~~~~~~~~~~~