Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:72:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <G[node].size(); i++){ ^ user.cpp:94:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++){ ^ user.cpp: In function ‘char nextch()’: user.cpp:13:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, BUF_SIZE, 1, fi); ^