Compilare: user.cpp: In function ‘int main()’: user.cpp:32:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x < v[i].size()) nr1 = v[i][0]; ^ user.cpp:33:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(y < vt[i].size()) nr2 = vt[i][0]; ^ user.cpp:34:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(x < v[i].size() && y < vt[i].size()) ^ user.cpp:34:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(x < v[i].size() && y < vt[i].size()) ^ user.cpp:58:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(x < v[i].size()) ^ user.cpp:64:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(y < vt[i].size()) ^ user.cpp:11:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("incurcatura.in","r",stdin); ^ user.cpp:12:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("incurcatura.out","w",stdout); ^ user.cpp: In function ‘void Nxt()’: user.cpp:104:33: 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,smax,stdin); ^