Compilare: user.cpp: In function ‘void rez()’: user.cpp:52:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j < G[i].size(); j++){cout<<G[i][j]<<" "; ^ user.cpp:49:12: warning: unused variable ‘idx’ [-Wunused-variable] int i, idx, j; ^ user.cpp: In function ‘void citire()’: user.cpp:29:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lupu.in", "r", stdin); ^ user.cpp:30:41: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buffer, 1, Buffer_Size, stdin); ^