Compilare: user.cpp: In function ‘void checkSol()’: user.cpp:19:9: warning: unused variable ‘ef’ [-Wunused-variable] int ef = 0; ^ user.cpp: In function ‘int main()’: user.cpp:69:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("scara2.in", "r", stdin); ^ user.cpp:70:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("scara2.out", "w", stdout); ^ user.cpp:73:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &h, &n, &m, &p); ^