Compilare: user.cpp: In function ‘int divide(int, int, int)’: user.cpp:22:27: warning: left operand of comma operator has no effect [-Wunused-value] return (k - 1, (1 << k) - y + 1, (1 << (k - 1)) - x + 1) + 3 * (1 << 2*(k - 1)); ^ user.cpp:22:45: warning: right operand of comma operator has no effect [-Wunused-value] return (k - 1, (1 << k) - y + 1, (1 << (k - 1)) - x + 1) + 3 * (1 << 2*(k - 1)); ^ user.cpp: In function ‘int main()’: user.cpp:30:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fractal.in", "rt", stdin); ^ user.cpp:31:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fractal.out", "wt", stdout); ^ user.cpp:33:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &k, &y, &x); ^