Compilare: user.cpp: In function ‘void readFile()’: user.cpp:101:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &m); ^ user.cpp:103:50: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d%d%d\n", &a, &b, &c, &d, &e); ^ user.cpp:105:24: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 200000, f); ^ user.cpp: In function ‘void solve()’: user.cpp:22:21: warning: ‘nr3’ may be used uninitialized in this function [-Wmaybe-uninitialized] return (x & HASH); ^ user.cpp:125:19: note: ‘nr3’ was declared here int nr1, nr2, nr3; ^