Compilare: user.cpp: In function ‘void solve()’: user.cpp:72:130: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (s <= m && (ef[i] > ef[i ^ cf] + p * (x != 1) + 1.0 * s / x || (ef[i] == ef[i ^ cf] + p * (x != 1) + 1.0 * s / x) && ^ user.cpp: In function ‘void read()’: user.cpp:40:37: 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:42:41: 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); ^ user.cpp: In function ‘void write()’: user.cpp:89:39: 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); ^