Compilare: user.cpp:34:0: warning: "MAXN" redefined [enabled by default] #define MAXN 100000 ^ user.cpp:4:0: note: this is the location of the previous definition #define MAXN 1000000 ^ user.cpp: In function ‘char nextch()’: user.cpp:12:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^