Submission #343670

#	Time	Username	Problem	Language	Result	Execution time	Memory
343670		Galebickosikasa	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	434 ms	159980 KiB

joi2019_ho_t1

// #pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,sse4.1,sse4.2,popcnt,abm,mmx,avx")
// #pragma comment(linker, "/stack:200000000"]
 
#include <iostream>
#include <vector>
#include <cmath>
#include <algorithm>
#include <unordered_set>
#include <unordered_map>
#include <set>
#include <map>
#include <queue>
#include <deque>
#include <bitset>
#include <stack>
#include <random>
#include <fstream>
#include <sstream>
#include <chrono>

#define fi first
#define se second
#define pb push_back
#define ll long long
#define ld long double
#define hm unordered_map 
#define pii pair<int, int>
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define cinv(v) for (auto& x: v) cin >> x
#define fr(i, n) for (int i = 0; i < n; ++i)
#define fl(i, l, n) for (int i = l; i < n; ++i)

#define int ll

template <typename T1, typename T2> inline bool chkmin(T1 &x, const T2 &y) {if (x > y) {x = y; return 1;} return 0;}
template <typename T1, typename T2> inline bool chkmax(T1 &x, const T2 &y) {if (x < y) {x = y; return 1;} return 0;}

using namespace std;

#ifdef LOCAL
	#define dbg(x) cerr << #x << " : " << x << '\n'
	const int maxn = 20;
#else 
	#define dbg(x)
	const int maxn = 3000 + 20;
#endif

//tg: @galebickosikasa
 
ostream& operator << (ostream& out, const pii& v) {
	out << v.fi << ", " << v.se;
	return out;
}

template<typename T> ostream& operator << (ostream& out, const vector<T>& v) {
    for (auto& x: v) out << x << " ";
    return out;
}

istream& operator >> (istream& in, pii& a) {
	in >> a.fi >> a.se;
	return in;
}

const ll inf = (ll) 2e9;
const ld pi = asin (1) * 2;
const ld eps = 1e-8;
const ll mod = (ll)1e9 + 7;
const ll ns = 97;

mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

int dp1[maxn][maxn], dp2[maxn][maxn];
char goo[maxn][maxn];

signed main () {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);
	int n, m;
	cin >> n >> m;
	fr (i, n) fr (j, m) cin >> goo[i][j];
	for (int i = 0; i < n; ++i) {
		for (int j = m - 1; j >= 0; --j) {
			dp1[i][j] = dp1[i][j + 1] + (goo[i][j] == 'O');
		}
	}
	for (int j = 0; j < m; ++j) {
		for (int i = n - 1; i >= 0; --i) {
			dp2[i][j] = dp2[i + 1][j] + (goo[i][j] == 'I');
		}
	}
	int ans = 0;
	for (int i = 0; i < n; ++i) {
		for (int j = 0; j < m; ++j) {
			ans += dp1[i][j] * dp2[i][j] * (goo[i][j] == 'J');
			if (goo[i][j] == 'J') {
				dbg (i);
				dbg (j);
				dbg (dp1[i][j]);
				dbg (dp2[i][j]);
			}
		}
	}
	cout << ans << '\n';
	






}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50