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Submission #156298

# Submission time Handle Problem Language Result Execution time Memory
156298 2019-10-05T00:51:34 Z luciocf Nafta (COI15_nafta) C++14
100 / 100
 793 ms 96160 KB 
#include <bits/stdc++.h>

using namespace std;

const int maxn = 2e3+10;

int linha[] = {-1, 1, 0, 0};
int coluna[] = {0, 0, -1, 1};

int n, m;
char tab[maxn][maxn];

int cc;
bool mark[maxn][maxn];

int comp[maxn][maxn], soma[maxn*maxn];
int ini[maxn*maxn], fim[maxn*maxn];

int dentro[maxn][maxn], qtd[maxn][maxn];

int dp[maxn][maxn], opt[maxn][maxn];

void dfs(int i, int j)
{
	mark[i][j] = 1;
	ini[cc] = min(ini[cc], j), fim[cc] = max(fim[cc], j);

	soma[cc] += (int)(tab[i][j]-'0');

	for (int k = 0; k < 4; k++)
	{
		int a = i+linha[k], b = j+coluna[k];

		if (a < 1 || a > n || b < 1 || b > m || mark[a][b] || tab[a][b] == '.') continue;

		dfs(a, b);
	}
}

void solve(int i, int l, int r)
{
	if (l > r) return;

	int mid = (l+r)>>1;

	for (int j = opt[l-1][i]; j < mid && j <= opt[r+1][i]; j++)
		if (dp[mid][i] < dp[j][i-1] + qtd[mid][j])
			dp[mid][i] = dp[j][i-1] + qtd[mid][j], opt[mid][i] = j;

	solve(i, l, mid-1); solve(i, mid+1, r);
}

int main(void)
{
	scanf("%d %d", &n, &m);

	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= m; j++)
			scanf(" %c", &tab[i][j]);

	for (int i = 1; i <= n; i++)
	{
		for (int j = 1; j <= m; j++)
		{
			if (tab[i][j] != '.' && !mark[i][j])
			{
				++cc;
				ini[cc] = fim[cc] = j;
				dfs(i, j);
			}
		}
	}

	for (int i = 1; i <= cc; i++)
		for (int j = ini[i]; j <= fim[i]; j++)
			dentro[ini[i]][j] += soma[i];

	for (int i = 1; i <= m; i++)
		for (int j = i-1; j >= 0; j--)
			qtd[i][j] = dentro[j+1][i] + qtd[i][j+1];

	for (int i = 1; i <= m; i++)
	{
		opt[0][i] = 0, opt[m+1][i] = m;

		solve(i, 1, m);
	}

	for (int i = 1; i <= m; i++)
	{
		int ans = 0;
		for (int j = 1; j <= m; j++)
			ans = max(ans, dp[j][i]);

		printf("%d\n", ans);
	}
}

Compilation message

nafta.cpp: In function 'int main()':
nafta.cpp:55:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~~
nafta.cpp:59:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf(" %c", &tab[i][j]);
    ~~~~~^~~~~~~~~~~~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1528 KB Output is correct
2 Correct 3 ms 1400 KB Output is correct
3 Correct 3 ms 1144 KB Output is correct
4 Correct 3 ms 1400 KB Output is correct
5 Correct 3 ms 1400 KB Output is correct
6 Correct 3 ms 1272 KB Output is correct

Subtask #2
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1528 KB Output is correct
2 Correct 3 ms 1400 KB Output is correct
3 Correct 3 ms 1144 KB Output is correct
4 Correct 3 ms 1400 KB Output is correct
5 Correct 3 ms 1400 KB Output is correct
6 Correct 3 ms 1272 KB Output is correct
7 Correct 17 ms 7420 KB Output is correct
8 Correct 19 ms 7544 KB Output is correct
9 Correct 20 ms 7800 KB Output is correct
10 Correct 17 ms 7416 KB Output is correct
11 Correct 18 ms 7260 KB Output is correct
12 Correct 17 ms 6648 KB Output is correct

Subtask #3
66.0 / 66.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1528 KB Output is correct
2 Correct 3 ms 1400 KB Output is correct
3 Correct 3 ms 1144 KB Output is correct
4 Correct 3 ms 1400 KB Output is correct
5 Correct 3 ms 1400 KB Output is correct
6 Correct 3 ms 1272 KB Output is correct
7 Correct 17 ms 7420 KB Output is correct
8 Correct 19 ms 7544 KB Output is correct
9 Correct 20 ms 7800 KB Output is correct
10 Correct 17 ms 7416 KB Output is correct
11 Correct 18 ms 7260 KB Output is correct
12 Correct 17 ms 6648 KB Output is correct
13 Correct 671 ms 71608 KB Output is correct
14 Correct 714 ms 68808 KB Output is correct
15 Correct 793 ms 96160 KB Output is correct
16 Correct 633 ms 68644 KB Output is correct
17 Correct 673 ms 63140 KB Output is correct
18 Correct 646 ms 61616 KB Output is correct