Compilare: main.cpp: In function 'void readArc()': main.cpp:32:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&newFrom,&newTo,&newCost); ^ main.cpp: In function 'void read()': main.cpp:46:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&vertices,&arcs); ^ main.cpp: In function 'int main()': main.cpp:114:40: 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); ^ main.cpp:115:42: 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); ^