Eroare de compilare: user.cpp:9:17: error: ISO C++ forbids declaration of ‘dfs’ with no type [-fpermissive] dfs(int x, int c) ^ user.cpp: In function ‘int dfs(int, int)’: user.cpp:13:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a[x].size(); i++) ^ user.cpp:16:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:22:18: warning: unused variable ‘sum’ [-Wunused-variable] int n, m, x, y, sum = 0; ^