Compilare: user.cpp: In function ‘int main()’: user.cpp:52:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <= maskM; ++i) ^ user.cpp:88:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (numBits[j] == K) ^ user.cpp:75:22: warning: unused variable ‘k’ [-Wunused-variable] unsigned k = 0; ^ user.cpp:24:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ture.in", "r", stdin); ^ user.cpp:25:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ture.out", "w", stdout); ^ user.cpp:27:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &N, &M, &K, &P); ^ user.cpp:40:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^