Compilare: user.cpp: In function ‘int main()’: user.cpp:22:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1,k = 0, b = 1,p = 0;i <= l;k++){ ^ user.cpp:26:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = b;j && i <= l;j >>= 1){ ^ 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("subbit.in", "r", stdin); ^ user.cpp:18:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("subbit.out", "w", stdout); ^ user.cpp:19:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s+1); ^