Compilare: user.cpp: In function ‘int bellman()’: user.cpp:56:9: warning: unused variable ‘i’ [-Wunused-variable] int i, flow; ^ user.cpp: In function ‘int main()’: user.cpp:133:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trafic.in","r",stdin); ^ user.cpp:134:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trafic.out","w",stdout); ^ user.cpp:136:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &R); ^ user.cpp:138:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &d); ^