oj.uz

Submission #803793

# Submission time Handle Problem Language Result Execution time Memory
803793 2023-08-03T06:04:27 Z 박상훈(#10101) Shifty Grid (CCO17_shifty) C++17
25 / 25
 51 ms 1680 KB 
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int n, m;

int a[101][101], b[101][101];
pair<int, int> pos[100100];
vector<array<int, 3>> Q;

void shiftR(int i, int c){
	assert(0 <= c && c < m);
	for (int j=0;j<m;j++) b[i][(j+c)%m] = a[i][j];
	for (int j=0;j<m;j++){
		a[i][j] = b[i][j];
		pos[a[i][j]] = {i, j};
	} 

	Q.push_back({1, i+1, c});
	if (Q.size() >= 100000) exit(0);
}

void shiftC(int j, int c){
	assert(0 <= c && c < n);
	for (int i=0;i<n;i++) b[(i+c)%n][j] = a[i][j];
	for (int i=0;i<n;i++){
		a[i][j] = b[i][j];
		pos[a[i][j]] = {i, j};
	}

	Q.push_back({2, j+1, c});
	if (Q.size() >= 100000) exit(0);
}

void solveR(int p){
	for (int j=0;j<m;j++){
		auto [cx, cy] = pos[p*m + j];
		if (cx==p && cy==j) continue;
		if (cx==p){
			shiftC(j, 1);
			shiftC(cy, 1);
			shiftR(p+1, (m+j-cy) % m);
			shiftC(j, n-1);
			shiftC(cy, n-1);
		}

		else if (cy==j){
			shiftR(cx, 1);
			shiftC(j, (n+cx-p) % n);
			shiftR(cx, m-1);
			shiftC(j, (n+p-cx) % n);
		}

		else{
			shiftC(j, (n+cx-p) % n);
			shiftR(cx, (m+j-cy) % m);
			shiftC(j, (n+p-cx) % n);
		}
	}

	// printf("ok\n");
	// for (int i=0;i<n;i++){
	// 	for (int j=0;j<m;j++) printf("%d ", a[i][j]);
	// 	printf("\n");
	// }
}

void swap2(int p, int q){
	shiftC(p, 1);
	shiftR(0, (m+q-p) % m);
	shiftC(q, 1);
	shiftR(0, (m+p-q) % m);
	shiftC(p, 1);
}

void sort2(){
	for (int j=0;j<m;j++){
		auto [cx, cy] = pos[m+j];
		if (cy==j) continue;
		swap2(j, cy);
	}
}

void swapn(int p, int q){
	for (int i=0;i<n;i++){
		if (i%2==0){
			shiftC(q, n-1);
			shiftR(n-1, (m+q-p) % m);
		}

		else{
			shiftC(q, n-1);
			shiftR(n-1, (m+p-q) % m);
		}
	}

	shiftC(q, n-1);

}

void sortn(){
	for (int j=0;j<m;j++){
		auto [cx, cy] = pos[(n-1)*m+j];
		if (cy==j) continue;
		swapn(j, cy);
	}
}

void solve(){
	Q.clear();
	for (int i=0;i<n;i++){
		for (int j=0;j<m;j++) pos[a[i][j]] = {i, j};
	}

	for (int i=0;i<n-1;i++) solveR(i);
	if (m==2){
		if (a[n-1][0] > a[n-1][1]) shiftR(n-1, 1);
	}
	else if (n==2) sort2();
	else sortn();
}

mt19937 seed(1557);
uniform_int_distribution<int> rng(0, 2147483647);
int getrand(int l, int r){return rng(seed)%(r-l+1) + l;}

vector<array<int, 3>> X;

void gen(){
	n = getrand(1, 10)*2, m = getrand(1, 10)*2;
	for (int i=0;i<n;i++){
		for (int j=0;j<m;j++) a[i][j] = i*m+j;
	}

	X.clear();
	Q.clear();
	for (int z=0;z<20;z++){
		int typ = getrand(0, 1);
		if (typ==0){
			shiftR(getrand(0, n-1), getrand(0, m-1));
		}

		else{
			shiftC(getrand(0, m-1), getrand(0, n-1));
		}
	}

	X = Q;
}

set<vector<int>> st;
int stress(int tc){
	printf("----------------------------------\n");
	printf("Stress #%d\n", tc);
	gen();

	printf("Input:\n");
	printf("%d %d\n", n, m);
	for (int i=0;i<n;i++){
		for (int j=0;j<m;j++) printf("%d ", a[i][j]);
		printf("\n");
	}
	printf("\n");

	solve();

	for (int i=0;i<n;i++){
		for (int j=0;j<m;j++) if (a[i][j]!=i*m+j){
			printf("Failed:\n");

			for (int i=0;i<n;i++){
				for (int j=0;j<m;j++) printf("%d ", a[i][j]);
				printf("\n");
			}

			// vector<int> V;
			// for (int j=0;j<m;j++) V.push_back(a[i][j]);

			// for (int j=0;j<m-1;j++){
			// 	swap(a[i][j], a[i][j+1]);
			// 	if (is_sorted(a[i], a[i]+m)) return 1;
			// 	swap(a[i][j], a[i][j+1]);
			// }
			// st.insert(V);

			assert(0);
		}
	}

	printf("Accepted: %d\n", (int)Q.size());
	return 0;
}

void simulate(int n, int m, const vector<array<int, 3>> &Q){
	for (int i=0;i<n;i++){
		for (int j=0;j<m;j++) a[i][j] = i*m + j;
	}

	for (auto &[x, y, z]:Q){
		if (x==1) shiftR(y-1, z);
		else shiftC(y-1, z);

		printf("------------------------\n");
		printf("%d %d %d\n", x, y, z);
		for (int i=0;i<n;i++){
			for (int j=0;j<m;j++) printf("%2d ", a[i][j]);
			printf("\n");
		}
	}

	printf("ok %d\n", (int)Q.size());
}

int main(){
	// for (int i=1;i<=100;i++) stress(i);

	// int cnt = 1;
	// while(true){
	// 	if (stress(cnt++)) break;
	// }

	// printf("ok %d + %d generated\n", (int)X.size(), (int)Q.size());
	// for (auto &x:Q) X.push_back(x);

	// simulate(6, 6, X);
	// for (auto &V:st){
	// 	for (auto &x:V) printf("%d ", x);
	// 	printf("\n");
	// }

	scanf("%d %d", &n, &m);
	for (int i=0;i<n;i++){
		for (int j=0;j<m;j++){
			scanf("%d", a[i]+j);
			pos[a[i][j]] = {i, j};
		} 
	}

	solve();

	// printf("ok done\n");
	// for (int i=0;i<n;i++){
	// 	for (int j=0;j<m;j++) printf("%d ", a[i][j]);
	// 	printf("\n");
	// }

	printf("%d\n", (int)Q.size());
	for (auto &[x, y, z]:Q) printf("%d %d %d\n", x, y, z);
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:232:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  232 |  scanf("%d %d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~~
Main.cpp:235:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  235 |    scanf("%d", a[i]+j);
      |    ~~~~~^~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 22 ms 1104 KB Output is correct
7 Correct 28 ms 1104 KB Output is correct
8 Correct 21 ms 1080 KB Output is correct
9 Correct 1 ms 340 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 22 ms 1104 KB Output is correct
19 Correct 28 ms 1104 KB Output is correct
20 Correct 21 ms 1080 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 15 ms 976 KB Output is correct
23 Correct 51 ms 1680 KB Output is correct
24 Correct 39 ms 1436 KB Output is correct
25 Correct 33 ms 1380 KB Output is correct
26 Correct 23 ms 1104 KB Output is correct
27 Correct 41 ms 1476 KB Output is correct
28 Correct 41 ms 1524 KB Output is correct
29 Correct 40 ms 1488 KB Output is correct
30 Correct 42 ms 1496 KB Output is correct
31 Correct 42 ms 1564 KB Output is correct
32 Correct 40 ms 1492 KB Output is correct
33 Correct 6 ms 660 KB Output is correct
34 Correct 5 ms 660 KB Output is correct
35 Correct 1 ms 340 KB Output is correct
36 Correct 24 ms 1312 KB Output is correct
37 Correct 5 ms 468 KB Output is correct
38 Correct 5 ms 660 KB Output is correct
39 Correct 6 ms 688 KB Output is correct
40 Correct 12 ms 908 KB Output is correct
41 Correct 5 ms 628 KB Output is correct
42 Correct 4 ms 596 KB Output is correct
43 Correct 21 ms 1084 KB Output is correct
44 Correct 3 ms 480 KB Output is correct
45 Correct 15 ms 976 KB Output is correct
46 Correct 8 ms 788 KB Output is correct