Compilare: main.cpp: In function 'void do_testcase()': main.cpp:89:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz >= D.size()-1) poz = D.size() - 1; ~~~~^~~~~~~~~~~~~ main.cpp: In function 'void read(int&)': main.cpp:30:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(ch, 1, bsize, stdin); ^ main.cpp:41:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(ch, 1, bsize, stdin); ^ main.cpp: In function 'int main()': main.cpp:104:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sec.in", "r", stdin); ^ main.cpp:105:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sec.out", "w", stdout); ^ main.cpp:106:31: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(ch, 1, bsize, stdin); ^