Submission #624849

#	Time	Username	Problem	Language	Result	Execution time	Memory
624849		QwertyPi	Sandcastle 2 (JOI22_ho_t5)	C++14	71 / 100	1172 ms	1048576 KiB

Main

#include <bits/stdc++.h>
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("Ofast")
using namespace std;

const int N = 15013;
const int SQ = 240;
int a[200013];
int b[200013];
bool f[200013];
int s[200013];
int h, w;
inline int id(int i, int j){
	return i * (w + 1) + j;
}
inline int id2(int i, int j){
	return j * (h + 1) + i;
}

inline int qry(int x1, int x2, int y1, int y2){
	return s[id(x2 + 1, y2 + 1)] + s[id(x1, y1)] - s[id(x2 + 1, y1)] - s[id(x1, y2 + 1)];
}


struct PartialSum2D{
	vector<vector<short>> a, ps;
	PartialSum2D() = default;
	PartialSum2D(int n, int m){
		a = ps = vector<vector<short>>(n + 1, vector<short>(m + 1));
	}
	void upd(int x1, int x2, int y1, int y2, int v){
		a[x2 + 1][y2 + 1] += v;
		a[x1][y2 + 1] -= v;
		a[x2 + 1][y1] -= v;
		a[x1][y1] += v;
	}
	void run(int n){
		for(int i = 1; i <= n; i++){
			for(int j = 1; j <= n; j++){
				ps[i][j] = ps[i - 1][j] + ps[i][j - 1] - ps[i - 1][j - 1] + a[i - 1][j - 1];
			}
		}
	}
	int qry(int x, int y){
		return ps[x + 1][y + 1];
	}
} ps[SQ][SQ];

int g(int l, int r){
	ps[l][r].run(w);
	int ans = 0;
	for(int i = 0; i < w; i++){
		for(int j = i; j < w; j++){
			ans += ps[l][r].qry(i, j) == (r - l + 1) * (j - i + 1) - 1;
		}
	}
	return ans;
}

int32_t main(){
	cin.tie(0); cout.tie(0);
	ios_base::sync_with_stdio(false);
	
	cin >> h >> w;
	for(int i = 0; i < h; i++){
		for(int j = 0; j < w; j++){
			cin >> a[id(i, j)];
		}
	}
	if(h > w){
		for(int i = 0; i < h; i++){
			for(int j = 0; j < w; j++){
				b[id2(i, j)] = a[id(i, j)];
			}
		}
		for(int i = 0; i < h; i++){
			for(int j = 0; j < w; j++){
				a[id2(i, j)] = b[id2(i, j)];
			}
		}
		swap(w, h);
	}
	{
		set<int> S; map<int, int> M;
		for(int i = 0; i < h; i++){
			for(int j = 0; j < w; j++){
				S.insert(a[id(i, j)]);
			}
		}
		int idx = 0;
		for(auto j : S){
			M[j] = idx++;
		}
		for(int i = 0; i < h; i++){
			for(int j = 0; j < w; j++){
				a[id(i, j)] = M[a[id(i, j)]];
			}
		}
	}
	
	for(int x1 = 0; x1 < h; x1++){
		for(int x2 = x1; x2 < h; x2++){
			ps[x1][x2] = PartialSum2D(w, w);
		}
	}
	int ans = 0;
	for(int i = 0; i < h; i++){
		for(int j = 0; j < w - 1; j++){
			int v1 = a[id(i, j)], v2 = a[id(i, j + 1)];
			if(v1 > v2) swap(v1, v2);
			for(int x = 0; x < h; x++){
				for(int y = 0; y < w; y++){
					f[id(x, y)] = a[id(x, y)] > v1 && a[id(x, y)] < v2;
				}
			}
			for(int x = 0; x < h; x++){
				for(int y = 0; y < w; y++){
					s[id(x + 1, y + 1)] = s[id(x + 1, y)] + s[id(x, y + 1)] - s[id(x, y)] + f[id(x, y)];
				}
			}
			int x1 = i, x2 = i, y1 = j, y2 = j + 1;
			for(int x3 = 0; x3 <= x1; x3++){
				int y3 = 0, y4 = w - 1;
				for(int x4 = x2; x4 < h; x4++){
					if(qry(x3, x4, y1, y2)) continue;
					while(qry(x3, x4, y3, y1)) y3++;
					while(qry(x3, x4, y2, y4)) y4--;
					ps[x3][x4].upd(y3, y1, y2, y4, 1);
				}
			}
		}
	}

	for(int i = 0; i < h - 1; i++){
		for(int j = 0; j < w; j++){
			int v1 = a[id(i, j)], v2 = a[id(i + 1, j)];
			if(v1 > v2) swap(v1, v2);
			for(int x = 0; x < h; x++){
				for(int y = 0; y < w; y++){
					f[id(x, y)] = a[id(x, y)] > v1 && a[id(x, y)] < v2;
				}
			}
			for(int x = 0; x < h; x++){
				for(int y = 0; y < w; y++){
					s[id(x + 1, y + 1)] = s[id(x + 1, y)] + s[id(x, y + 1)] - s[id(x, y)] + f[id(x, y)];
				}
			}
			int x1 = i, x2 = i + 1, y1 = j, y2 = j;
			for(int x3 = 0; x3 <= x1; x3++){
				int y3 = 0, y4 = w - 1;
				for(int x4 = x2; x4 < h; x4++){
					if(qry(x3, x4, y1, y2)) continue;
					while(qry(x3, x4, y3, y1)) y3++;
					while(qry(x3, x4, y2, y4)) y4--;
					ps[x3][x4].upd(y3, y1, y2, y4, 1);
				}
			}
		}
	}
	for(int x1 = 0; x1 < h; x1++){
		for(int x2 = x1; x2 < h; x2++){
			ans += g(x1, x2);
		}
	}
	cout << ans << endl;
}

• Subtask 1: 0 / 9
• Subtask 2: 10 / 10
• Subtask 3: 5 / 5
• Subtask 4: 56 / 56
• Subtask 5: 0 / 20