Compilare: user.cpp: In function ‘int key(std::pair<int, int>)’: user.cpp:13:66: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] int val = ((long long)v.first ^ 474658 + (v.second ^ 475829) + v.second * 3LL) % 666013; ^ user.cpp: In function ‘int main()’: user.cpp:51:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("shukarime.in", "r", stdin); ^ user.cpp:52:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("shukarime.out", "w", stdout); ^ user.cpp: In function ‘void Next()’: user.cpp:103:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread (sir, 1, maxl, stdin), pos = 0; ^