Compilare: main.cpp: In function 'int main()': main.cpp:146:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<g[i].size(); j++) ~^~~~~~~~~~~~ main.cpp:162:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<succ[u].size(); i++){ ~^~~~~~~~~~~~~~~ main.cpp:170:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<comp[i].size(); j++) ~^~~~~~~~~~~~~~~ main.cpp: In function 'char read_ch()': main.cpp:52:33: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(_in_buff, 1, 4096, _fin); ^