oj.uz

Submission #637394

# Submission time Handle Problem Language Result Execution time Memory
637394 2022-09-01T15:53:44 Z IWTIM Selotejp (COCI20_selotejp) C++17
110 / 110
 277 ms 12192 KB 
# include <bits/stdc++.h>
using namespace std;
#define f first
#define s second
//#define int long long
#define pii pair <int, int>
#define pb push_back
const int N = 2000, inf = 1e9;
int t,n,m, dp[N][N],a[N][N], dphor[N],toadd[N];
main() {
    std::ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
    cin>>n>>m;
    for (int i = 1; i <= n; i++) {
    	for (int j = 0; j < m; j++) {
    		char ch;
    		cin>>ch;
    		a[i][j] = (ch == '#');
		}
	}
	for (int i = 0; i <= n; i++) {
		for (int j = 0; j < (1<<m); j++) {
			dp[i][j] = inf;
		}
	}
	dp[0][0] = 0;
	for (int i = 1; i <= n; i++) {
		int all = 0;
		for (int x = 0; x < m; x++) {
			if (a[i][x]) all |= (1<<x);
		}
		for (int mask = 0; mask < (1<<m); mask++) {
			// Using only horizontal chains
			dphor[mask] = 0;
			if ((mask|all) != all) continue;
			for (int x = 0; x < m; x++) {
				if (mask&(1<<x)) {
					if (x == 0) {
						dphor[mask]++; continue;
					}
					if (mask&(1<<(x - 1))) continue;
					else  dphor[mask]++; 
				}
			}
		}
		for (int mask = 0; mask < (1<<m); mask++) toadd[mask] = inf;
		for (int mask = 0; mask < (1<<m); mask++) {
			// at least mask is used in the previous row
			for (int x = mask; x >= 0; x = (x - 1)&mask) {
				toadd[x] = min(toadd[x], dp[i - 1][mask]);
				if (x == 0) break;
			}
		}
		for (int mask = 0; mask < (1<<m); mask++) {
			dp[i][mask] = inf;
			// If a square is covered by a vertical chain ----- > mask[j] == 1
			// else mask[j] = 0;
			if ((mask | all) != all) continue;
			for (int x = mask; x >= 0; x = (x - 1) & mask) {
				dp[i][mask] = min(dp[i][mask], toadd[x] + __builtin_popcount(x ^ mask) + dphor[all ^ mask]);
				if (x == 0) break;
			}
		}
	}
	
	int ans = inf;
	for (int mask = 0; mask < (1<<m); mask++) ans = min(ans, dp[n][mask]);
	cout<<ans<<"\n";
}

Compilation message

Main.cpp:10:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   10 | main() {
      | ^~~~

Subtask #1
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 80 ms 11220 KB Output is correct
3 Correct 13 ms 8612 KB Output is correct
4 Correct 31 ms 9988 KB Output is correct
5 Correct 81 ms 11988 KB Output is correct
6 Correct 85 ms 12036 KB Output is correct
7 Correct 79 ms 11748 KB Output is correct
8 Correct 74 ms 11220 KB Output is correct
9 Correct 92 ms 11220 KB Output is correct
10 Correct 199 ms 12192 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 460 KB Output is correct
4 Correct 2 ms 460 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 2 ms 468 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 80 ms 11220 KB Output is correct
3 Correct 13 ms 8612 KB Output is correct
4 Correct 31 ms 9988 KB Output is correct
5 Correct 81 ms 11988 KB Output is correct
6 Correct 85 ms 12036 KB Output is correct
7 Correct 79 ms 11748 KB Output is correct
8 Correct 74 ms 11220 KB Output is correct
9 Correct 92 ms 11220 KB Output is correct
10 Correct 199 ms 12192 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 460 KB Output is correct
14 Correct 2 ms 460 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 2 ms 468 KB Output is correct
19 Correct 4 ms 8148 KB Output is correct
20 Correct 15 ms 9228 KB Output is correct
21 Correct 35 ms 10196 KB Output is correct
22 Correct 82 ms 11732 KB Output is correct
23 Correct 79 ms 11744 KB Output is correct
24 Correct 81 ms 11672 KB Output is correct
25 Correct 85 ms 11956 KB Output is correct
26 Correct 112 ms 11476 KB Output is correct
27 Correct 178 ms 11476 KB Output is correct
28 Correct 277 ms 11860 KB Output is correct