Compilare: main.cpp: In function 'int updateAIB(int, int, int)': main.cpp:102:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'void DFS(int, int)': main.cpp:131:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[node].size(); i++){ ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'char nextch()': main.cpp:28:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fin); ^