Compilare: user.cpp: In function ‘int main()’: user.cpp:84:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < v[i].size() / 2; k++) ^ user.cpp:113:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=1; j<v[i].size(); j++) ^ user.cpp:64:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ulei.in", "r", stdin); ^ user.cpp:65:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ulei.out", "w", stdout); ^ user.cpp: In function ‘void Next()’: user.cpp:160:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread (sir, 1, maxl, stdin), pos = 0; ^