Compilare: user.cpp: In function ‘int main()’: user.cpp:74:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (H[0].size()==(1<<(N-j))) ^ user.cpp:76:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<H[0].size();++i) ^ user.cpp:83:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<H[1].size();++i) ^ user.cpp:90:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<H[1].size();++i) ^ user.cpp:96:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<chose.size();++i) ^ user.cpp:21:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bunicu.in","r",stdin); ^ user.cpp:22:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bunicu.out","w",stdout); ^ user.cpp:24:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (scanf("%d\n",&T);T;--T) ^ user.cpp:26:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&N); ^ user.cpp:37:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&type); ^ user.cpp:31:5: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1;i<=N;++i,scanf("\n")) ^