Compilare: main.cpp: In function 'int main()': main.cpp:136:27: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings] read_init("heavypath.in"); ^ main.cpp: In function 'char read_ch()': main.cpp:22:33: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, BUFFSIZE, fin); ^ main.cpp: In function 'int main()': main.cpp:137:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("heavypath.in", "r", stdin); ^ main.cpp:138:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("heavypath.out", "w", stdout); ^