Compilare: user.cpp: In function ‘int main()’: user.cpp:25:86: warning: unused variable ‘jIndex’ [-Wunused-variable] int i, j, sqrt_N = __builtin_sqrtf(N), iBitNumber, iIndex, iBit, jBitNumber, jIndex, jBit, count = 2; ^~~~~~ user.cpp:25:94: warning: unused variable ‘jBit’ [-Wunused-variable] int i, j, sqrt_N = __builtin_sqrtf(N), iBitNumber, iIndex, iBit, jBitNumber, jIndex, jBit, count = 2; ^~~~ user.cpp:16:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciur.in", "r", stdin); ^ user.cpp:17:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciur.out", "w", stdout); ^ user.cpp:19:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int N; scanf("%d", &N); ^