Compilare: main.cpp: In function 'void init()': main.cpp:148:16: warning: operation on 'anc[i]' may be undefined [-Wsequence-point] anc[i] = cost[i] = anc[i] = sum[i] = 0; ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:24:38: 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); ^