Submission #68807

#	Time	Username	Problem	Language	Result	Execution time	Memory
68807		forestryks	Jetpack (COCI16_jetpack)	C++14	80 / 80	46 ms	10544 KiB

jetpack

///////////////////////////////////////////////////////////////////////////////////////////////
#include <bits/stdc++.h>
using namespace std;

#define mp make_pair
#define pb push_back
#define FAST_IO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define FILE_IO(x) freopen((string(x) + ".in").c_str(), "r", stdin); freopen((string(x) + ".out").c_str(), "w", stdout)
#define f first
#define s second
#define x1 x1qwer
#define y1 y1qwer
#define right right123
#define left left123
#define foreach(it, v) for (auto it : v)
#define rep(it, n) for (int it = 0; it < n; ++it)
#define forin(it, l, r) for (int it = l; it < r; ++it)
#define all(x) x.begin(), x.end()

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const double DINF = numeric_limits<double>::infinity();
const ll MOD = 1e9 + 7;
const double EPS = 1e-7;
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
mt19937 mmtw_(MOD);
uniform_int_distribution<ll> rd_;
ll randomll() { return rd_(mmtw_);}
ll rnd(ll x, ll y) { return rd_(mmtw_) % (y - x + 1) + x; }
template <class T> T fact(T n) { if (n == 1) return 1; return n * fact(n - 1); }
////////////////////////////////////////////////////////////////////////////////////////////////

const int MAXN = 1e5 + 5;
int n;
bool a[MAXN][10];
bool used[MAXN][10];
bool path[MAXN];
vector<pii> res;

void print() {
	for (int i = 0; i < n; ++i) {
		if (path[i]) {
			if (res.empty() || res.back().f + res.back().s < i) {
				res.push_back({i, 1});
			} else {
				res.back().s += 1;
			}
		}
	}

	cout << res.size() << endl;
	for (auto &it : res) {
		cout << it.f << ' ' << it.s << endl;
	}
}

bool dfs(int x, int y) {
	used[x][y] = true;

	if (x == n - 1) {
		print();
		exit(0);
	}

	if (y == 0) {
		if (!used[x + 1][y] && !a[x + 1][y]) {
			path[x] = false;
			dfs(x + 1, y);
		}
	} else {
		if (!used[x + 1][y - 1] && !a[x + 1][y - 1]) {
			path[x] = false;
			dfs(x + 1, y - 1);
		}
	}

	if (y == 9) {
		if (!used[x + 1][y] && !a[x + 1][y]) {
			path[x] = true;
			dfs(x + 1, y);
		}
	} else {
		if (!used[x + 1][y + 1] && !a[x + 1][y + 1]) {
			path[x] = true;
			dfs(x + 1, y + 1);
		}
	}
}

int main() {
	FAST_IO;
	cin >> n;
	rep(i, 10) {
		string s;
		cin >> s;
		rep(j, n) {
			a[j][9 - i] = (s[j] == 'X');
		}
	}

	dfs(0, 0);
}

Compilation message (stderr)

jetpack.cpp: In function 'bool dfs(int, int)':
jetpack.cpp:91:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

• Subtask 1: 80 / 80