Compilare: user.cpp: In function ‘void dfs_2(int)’: user.cpp:32:17: warning: unused variable ‘s’ [-Wunused-variable] int s=it->second; ^ user.cpp:33:17: warning: unused variable ‘nr’ [-Wunused-variable] int nr=nrfii[f]; ^ user.cpp: In function ‘int main()’: user.cpp:42:10: warning: unused variable ‘sir’ [-Wunused-variable] char sir[100]; ^ user.cpp:43:9: warning: unused variable ‘L’ [-Wunused-variable] int L; ^ user.cpp:44:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nustiu.in","r",stdin); ^ user.cpp:45:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nustiu.out","w",stdout); ^ user.cpp:47:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&T); ^ user.cpp:50:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:58:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^