Compilare: user.cpp: In function ‘int main()’: user.cpp:176:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < G[i].size(); ++j) { ^ user.cpp: In function ‘void read(int&)’: user.cpp:40:52: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] pos = 0, fread(buff, 1, buffDim, stdin); ^ user.cpp:47:52: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] pos = 0, fread(buff, 1, buffDim, stdin); ^ user.cpp: In function ‘void readData()’: user.cpp:58:35: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, buffDim, stdin); ^