Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:12:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<g[x].size(); i++) ^ user.cpp: In function ‘int dfs2(int)’: user.cpp:21:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<g[x].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:30:27: warning: unused variable ‘c’ [-Wunused-variable] int n, m, i, j, x, y, c, nr1=0, nr2=0; ^ user.cpp:31:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pamant.in","r",stdin); ^ user.cpp:32:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pamant.out","w",stdout); ^ user.cpp:33:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:36:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^