Compilare: main.cpp: In function 'void dfs(int, int, int)': main.cpp:83:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < edges[c][node].size(); i++){ ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:107:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < edges[2][1].size(); i++){ ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void Read(int&)': main.cpp:28:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^ main.cpp:33:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^