Compilare: main.cpp: In function 'void dfs(int)': main.cpp:44:24: warning: unused variable 'MAX' [-Wunused-variable] long long sum = 0, MAX=0; ^~~ main.cpp: In function 'void read(long long int&)': main.cpp:29:35: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(chr, 1, buffer, fin); ^ main.cpp:35:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(chr, 1, buffer, fin); ^