Compilare: main.cpp: In function 'int main()': main.cpp:86:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("semafoare.in", "r", stdin); ^ main.cpp:87:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("semafoare.out", "w", stdout); ^ main.cpp:90:68: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n%d %d %c\n%d %d ", &n, &m, &x1, &y1, &c1, &x2, &y2); ^ main.cpp:95:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%c ", &c); ^