Submission #38280

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
38280	2018-01-03T13:23:29 Z	nibnalin	Retro (COCI17_retro)	C++14	44 / 100	500 ms	334648 KB

retro

#include <iostream>
#include <cstdio>
#include <vector>
using namespace std;

const int maxn = 305, inf = int(1e5)+5;

const int xx[3] = {-1, -1, -1};
const int yy[3] = {-1, 0, 1};

int r, s, memoi[maxn][maxn][maxn];
pair<int, int> memo[maxn][maxn][maxn];
string A[maxn];

inline bool valid(int x, int y) { return (x >= -1 && y >= 0 && x < r && y < s); }

pair<int, int> DP(int x, int y, int diff)
{
	if(x == -1) return {(diff?-inf:0), inf};
	else if(diff < 0 || diff > r) return {-inf, inf};
	if(A[x][y] == '*') return {(diff?-inf:0), inf};
	else if(memo[x][y][diff].first != -1) return memo[x][y][diff];
	else if(A[x][y] == '(' || A[x][y] == ')')
	{
		int c;
		pair<int, int> res = {-inf, inf};
		if(A[x][y] == '(') c = 1;
		else c = -1;
		for(int i = 0;i < 3;i++)
		{
			int u = x+xx[i], v = y+yy[i];
			if(valid(u, v))
			{
				pair<int, int> tmp = DP(u, v, diff+c);
				if(tmp.first > res.first) res = tmp, memoi[x][y][diff] = i;
				else if(tmp.first == res.first && tmp.second < res.second) res = tmp, memoi[x][y][diff] = i;
			}
		}
		//cout << x << " " << y << " " << diff << " " << c << " " << res.first << " " << res.second << "\n";
		return memo[x][y][diff] = {res.first+1, A[x][y]};
	}
	else
	{
		pair<int, int> res = {-inf, inf};
		for(int i = 0;i < 3;i++)
		{
			int u = x+xx[i], v = y+yy[i];
			if(valid(u, v))
			{
				pair<int, int> tmp = DP(u, v, diff);
				if(tmp.first > res.first) res = tmp, memoi[x][y][diff] = i;
				else if(tmp.first == res.first && tmp.second < res.second) res = tmp, memoi[x][y][diff] = i;
			}
		}
		//cout << x << " " << y << " " << diff << " " << res.first << " " << res.second << "\n";
		return memo[x][y][diff] = res;
	}
}

int main(void)
{
	scanf("%d%d", &r, &s);
	for(int i = 0;i < r;i++) cin >> A[i];

	for(int i = 0;i < maxn;i++)
	{
		for(int j = 0;j < maxn;j++)
		{
			for(int k = 0;k < maxn;k++) memo[i][j][k] = {-1, -1}, memoi[i][j][k] = -1;
		}
	}

	int start;
	for(int i = 0;i < s;i++)
	{
		if(A[r-1][i] == 'M') start = i;
	}

	pair<int, int> res = DP(r-1, start, 0);
	pair<int, int> cur = {r-1, start};
	int diff = 0;

	printf("%d\n", res.first);
	while(cur.first != -1 && A[cur.first][cur.second] != '*')
	{
		int c = 0;
		if(A[cur.first][cur.second] == '(') c = 1;
		else if(A[cur.first][cur.second] == ')') c = -1;

		int dir = memoi[cur.first][cur.second][diff];
		pair<int, int> nex = {cur.first+xx[dir], cur.second+yy[dir]};
		if(c != 0) cout << A[cur.first][cur.second];
		cur = nex;
		diff += c;
	}
	cout << "\n";
}

Compilation message

retro.cpp: In function 'int main()':
retro.cpp:62:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &r, &s);
                       ^
retro.cpp:84:50: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized]
  while(cur.first != -1 && A[cur.first][cur.second] != '*')
                                                  ^

Subtask #1

44.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	69 ms	334516 KB	Output is correct
2	Correct	56 ms	334516 KB	Output is correct
3	Correct	79 ms	334516 KB	Output is correct
4	Correct	76 ms	334516 KB	Output is correct
5	Correct	96 ms	334516 KB	Output is correct
6	Partially correct	116 ms	334516 KB	Partially correct
7	Partially correct	83 ms	334516 KB	Partially correct
8	Partially correct	76 ms	334516 KB	Partially correct
9	Correct	83 ms	334516 KB	Output is correct
10	Partially correct	93 ms	334516 KB	Partially correct
11	Execution timed out	500 ms	334648 KB	Execution timed out
12	Partially correct	429 ms	334648 KB	Partially correct
13	Partially correct	366 ms	334648 KB	Partially correct
14	Partially correct	239 ms	334648 KB	Partially correct
15	Execution timed out	500 ms	334648 KB	Execution timed out
16	Execution timed out	500 ms	334648 KB	Execution timed out
17	Execution timed out	500 ms	334648 KB	Execution timed out
18	Execution timed out	500 ms	334648 KB	Execution timed out
19	Execution timed out	500 ms	334648 KB	Execution timed out
20	Execution timed out	500 ms	334648 KB	Execution timed out