Compilare: user.cpp: In function ‘int check_negative(int*)’: user.cpp:15:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < vecini[nod].size(); j++){ ^ user.cpp: In function ‘void bellmanford(int)’: user.cpp:36:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vecini[nod].size(); i++){ ^ user.cpp:31:9: warning: unused variable ‘ok’ [-Wunused-variable] int ok = 1; ^ user.cpp: In function ‘int main()’: user.cpp:51:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bellmanford.in","r",stdin); ^ user.cpp:52:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bellmanford.out","w",stdout); ^ user.cpp:53:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:55:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&c); ^