Compilare: user.cpp: In function ‘int main()’: user.cpp:75:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divisorgraph.in", "r", stdin); ^ user.cpp:76:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divisorgraph.out", "w", stdout); ^ user.cpp:79:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:82:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &v, &e); ^ user.cpp:94:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp: In function ‘void marcheaza(int, int)’: user.cpp:33:17: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(viz[last] == 1) ^ user.cpp: In function ‘int main()’: user.cpp:33:17: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:19:20: note: ‘last’ was declared here int st, dr, med, last; ^