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using u32 = unsigned int;
 
const int N = 5e7;
 
int n;
u32 seed, a[N];
 
inline u32 input(u32 x) {
	x ^= x << 13;
    x ^= x >> 17;
    x ^= x << 5;
    return x;
}
 
void output() {
    u32 re = n;
    u32 x = 23333333;
    for (u32 i = 0; i < n; i++) {
        re = re ^ (a[i] + x);
        x ^= x << 13;
        x ^= x >> 17;
        x ^= x << 5;
    }
    cout << re << '\n';
}
 
void solve() {
	cin >> n >> seed;
	for (int i = 0; i < n; i++) {
		seed = input(seed);
		a[i] = seed;
	}
	// sort
	output();
}

prog.cpp: In function ‘void output()’:
prog.cpp:24:5: error: ‘cout’ was not declared in this scope
     cout << re << '\n';
     ^~~~
prog.cpp: In function ‘void solve()’:
prog.cpp:28:2: error: ‘cin’ was not declared in this scope
  cin >> n >> seed;
  ^~~

Standard output is empty