Compilare: user.cpp: In function ‘int bellman()’: user.cpp:61:9: warning: unused variable ‘i’ [-Wunused-variable] int i, flow; ^ user.cpp: In function ‘int main()’: user.cpp:150:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < E.size(); i++) { ^ user.cpp:136:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tero.in","r",stdin); ^ user.cpp:137:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tero.out","w",stdout); ^ user.cpp:139:32: 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:141:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &d); ^