Compilare: user.cpp: In function ‘int main()’: user.cpp:51:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; (1 << i) <= v.size(); printf("\n"), ++i) ^ user.cpp:64:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < v.size(); ++i) ^ user.cpp:66:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == v.size()) continue; ^ user.cpp:19:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("test.in","r",stdin); ^ user.cpp:20:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("test.out","w",stdout); ^ user.cpp:22:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:25:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] where[a[i]] = i; ^