Compilare: main.cpp: In function 'long long int FMAXIM(int)': main.cpp:85:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < G[k].size(); i++) ~~^~~~~~~~~~~~~ main.cpp:94:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < G[k].size(); i++) ~~^~~~~~~~~~~~~ main.cpp: In function 'void dfs(int)': main.cpp:113:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < G[k].size(); i++) ~~^~~~~~~~~~~~~ main.cpp: In function 'char read_ch()': main.cpp:23:34: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^