Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:17: warning: statement is a reference, not call, to function ‘exit’ [-Waddress] exit; ^ user.cpp:16:17: warning: statement has no effect [-Wunused-value] user.cpp: In function ‘int main()’: user.cpp:70:19: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(dist[j]!=1000001) ^ user.cpp:108:19: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(dist[j]!=1000001) ^ 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("harta3.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("harta3.out","w",stdout); ^ user.cpp:46:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:47:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^ user.cpp:54:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&d); ^