Submission #1067873

#	Time	Username	Problem	Language	Result	Execution time	Memory
1067873		sleepntsheep	Archery (IOI09_archery)	C++17	Compilation error	0 ms	0 KiB

archery

#include <cstdio>
#include <map>
#include <array>
using namespace std;

using ll = long long;

int n, r, s[400], ans = 1e9, q[400], opt;

ll hash(array<int, 400> &a, int n) {
	const BASE = 137, MOD = 1000000007;
	ll z = 0, bp = 1;
	for (int i = 0; i < n; ++i) {
		z = (z + bp * a[i] % MOD) % MOD;
		(bp *= BASE) %= MOD;
	}
	return z;
}

int check() {
	array<int, 400> p, e;
	for (int i = 0; i < n * 2; ++i) p[i] = q[i];

	map<ll, int> mp;

	for (int ii = 0; ii < r; ++ii) {
		ll hh = hash(p, 2 * n);
		if (mp.count(hh)) {
			int gap = ii - mp[hh];
			int left = r - ii;
			r = ii + left % gap;
		} else {
			mp[hh] = ii;
		}

		int u = p[0], v = p[1];
		if (s[u] < s[v]) e[0] = u, e[n * 2 - 1] = v;
		else e[0] = v, e[n * 2 - 1] = u;

		for (int j = 2; j < n * 2; j += 2) {
			int u = p[j], v = p[j + 1];
			if (s[u] < s[v]) {
				e[(j - 2) + 1] = u;
				e[j] = v;
			} else {
				e[1 + (j - 2)] = v;
				e[j] = u;
			}
		}
		p = e;


	}

	for (int i = 0; i < 400; ++i) if (e[i] == 0) return (i + 1) / 2;
	__builtin_unreachable();
}

int main() {
	scanf("%d%d", &n, &r);
	for (int i = 0; i < n * 2; ++i)
		scanf("%d", s + i), q[i] = i;

	if (ans >= check()) ans = check(), opt = 1;

	for (int i = 1; i < n * 2; ++i) {
		int o = 0;
		for (int j = 1; j <= i; ++j) q[o++] = j;
		q[o++] = 0;
		for (int j = i + 1; j < n * 2; ++j) q[o++] = j;

		if (ans >= check()) ans = check(), opt = (i + 2) / 2;
	}

	printf("%d", opt);
}

Compilation message (stderr)

archery.cpp: In function 'll hash(std::array<int, 400>&, int)':
archery.cpp:11:8: error: 'BASE' does not name a type
   11 |  const BASE = 137, MOD = 1000000007;
      |        ^~~~
archery.cpp:14:24: error: 'MOD' was not declared in this scope
   14 |   z = (z + bp * a[i] % MOD) % MOD;
      |                        ^~~
archery.cpp:15:10: error: 'BASE' was not declared in this scope
   15 |   (bp *= BASE) %= MOD;
      |          ^~~~
archery.cpp: In function 'int check()':
archery.cpp:27:11: error: reference to 'hash' is ambiguous
   27 |   ll hh = hash(p, 2 * n);
      |           ^~~~
In file included from /usr/include/c++/10/optional:42,
                 from /usr/include/c++/10/bits/node_handle.h:39,
                 from /usr/include/c++/10/bits/stl_tree.h:72,
                 from /usr/include/c++/10/map:60,
                 from archery.cpp:2:
/usr/include/c++/10/bits/functional_hash.h:58:12: note: candidates are: 'template<class _Tp> struct std::hash'
   58 |     struct hash;
      |            ^~~~
archery.cpp:10:4: note:                 'll hash(std::array<int, 400>&, int)'
   10 | ll hash(array<int, 400> &a, int n) {
      |    ^~~~
archery.cpp: In function 'int main()':
archery.cpp:60:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |  scanf("%d%d", &n, &r);
      |  ~~~~~^~~~~~~~~~~~~~~~
archery.cpp:62:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |   scanf("%d", s + i), q[i] = i;
      |   ~~~~~^~~~~~~~~~~~~