Compilare: user.cpp: In function ‘i32 main()’: user.cpp:96:56: warning: operation on ‘i’ may be undefined [-Wsequence-point] v[--i] = (u64(v[-~i]) * A + B) % 0x367C2DC9; ^ user.cpp:103:56: warning: operation on ‘i’ may be undefined [-Wsequence-point] v[--i] = (u64(v[-~i]) * A + B) % 0x7CE67EF6; ^ user.cpp:110:56: warning: operation on ‘i’ may be undefined [-Wsequence-point] v[--i] = (u64(v[-~i]) * A + B) % 0x6F6E4E7B; ^ user.cpp: At global scope: user.cpp:71:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void write(u32 x) ^ user.cpp: In function ‘i32 main()’: user.cpp:86:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radixsort.in", "r", stdin); ^ user.cpp:88:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &N, &A, &B, &C); ^