Compilare: user.cpp: In function ‘void buf(int&)’: user.cpp:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void dfsJos(int, int)’: user.cpp:70: warning: comparison between signed and unsigned integer expressions user.cpp:82: warning: comparison between signed and unsigned integer expressions user.cpp:83: warning: unused variable ‘cost’ user.cpp: In function ‘void dfsSus(int)’: user.cpp:119: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:290: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result