CSES - Datatähti 2025 alku

CSES - Datatähti 2025 alku - Results

Submission details
Task:	Robotti
Sender:	TNT
Submission time:	2024-10-31 20:34:58 +0200
Language:	C++ (C++20)
Status:	READY
Result:	100

Feedback
group	verdict	score
#1	ACCEPTED	30
#2	ACCEPTED	70

Test results
test	verdict	time	group
#1	ACCEPTED	0.00 s	1, 2	details
#2	ACCEPTED	0.00 s	1, 2	details
#3	ACCEPTED	0.00 s	1, 2	details
#4	ACCEPTED	0.00 s	1, 2	details
#5	ACCEPTED	0.00 s	1, 2	details
#6	ACCEPTED	0.00 s	1, 2	details
#7	ACCEPTED	0.00 s	1, 2	details
#8	ACCEPTED	0.00 s	1, 2	details
#9	ACCEPTED	0.00 s	1, 2	details
#10	ACCEPTED	0.00 s	1, 2	details
#11	ACCEPTED	0.00 s	1, 2	details
#12	ACCEPTED	0.00 s	2	details
#13	ACCEPTED	0.00 s	2	details
#14	ACCEPTED	0.00 s	2	details
#15	ACCEPTED	0.00 s	2	details
#16	ACCEPTED	0.00 s	2	details
#17	ACCEPTED	0.01 s	2	details
#18	ACCEPTED	0.01 s	2	details
#19	ACCEPTED	0.01 s	2	details
#20	ACCEPTED	0.01 s	2	details
#21	ACCEPTED	0.01 s	2	details
#22	ACCEPTED	0.01 s	2	details
#23	ACCEPTED	0.01 s	2	details
#24	ACCEPTED	0.01 s	2	details

Compiler report

input/code.cpp: In function 'std::vector<int> CollectCoins(int, std::string, std::vector<int>, std::size_t)':
input/code.cpp:20:83: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |                 while ((((int)RobotPos-PrevSearch>=0) || ((int)RobotPos+PrevSearch<Layout.length())) && (DistanceLeft == -1 && DistanceRight == -1)) {
      |                                                           ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
input/code.cpp:20:119: warning: comparison of integer expressions of different signedness: 'std::size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   20 |                 while ((((int)RobotPos-PrevSearch>=0) || ((int)RobotPos+PrevSearch<Layout.length())) && (DistanceLeft == -1 && DistanceRight == -1)) {
      |                                                                                                          ~~~~~...

Code

#include <iostream>
#include <ostream>
#include <string>
#include <vector>

std::vector<int> CollectCoins(int Rooms, std::string Layout, std::vector<int> Output, std::size_t RobotPos = 0) {
	while (true) {
		if (RobotPos == 0) RobotPos = Layout.find('R');
		//std::cout << RobotPos << "\n";

		// Failsafe initializations
		std::size_t CoinLeft = -1;
		std::size_t DistanceLeft = -1;
		std::size_t CoinRight = -1;
		std::size_t DistanceRight = -1;

		// Iteratively search for coins
		int SearchDepth = 5;
		int PrevSearch = 0;
		while ((((int)RobotPos-PrevSearch>=0) || ((int)RobotPos+PrevSearch<Layout.length())) && (DistanceLeft == -1 && DistanceRight == -1)) {
			if (RobotPos != (size_t)0) {
				int SearchStart = (int)RobotPos-PrevSearch;
				if (SearchStart <= 0) SearchStart = 0;
				for (int i = SearchStart; (i>=SearchStart-SearchDepth) && (i>=0); i--) {
					//std::cout << "left: " << i << "\n";
					if (Layout[i]=='*') {
						CoinLeft = i;
						break;
					}
				}
				//std::cout << CoinLeft << "\n";
				if (CoinLeft!=-1) DistanceLeft = RobotPos - CoinLeft;
			}

			if (RobotPos != (size_t)(Rooms-1)) {
				int SearchStart = (int)RobotPos+PrevSearch;

				if (SearchStart >= Layout.length()) SearchStart = Layout.length()-1;
				for (int i = SearchStart; (i<=SearchStart+SearchDepth) && (i<Layout.length()); i++) {
					//std::cout << "right: "<< i << "\n";
					if (Layout[i]=='*') {
						CoinRight = i;
						break;
					}
				}
				//std::cout << CoinRight << "\n";
				if (CoinRight!=-1) DistanceRight = CoinRight - RobotPos;
			}
			PrevSearch += SearchDepth;
			//SearchDepth *= 2;
		}
		/*if (DistanceLeft < DistanceRight) {
			std::cout << "robot: "<< (int)RobotPos-PrevSearch << " " << RobotPos << " " << (int)RobotPos+PrevSearch << "\n";;
			std::cout << "left: "<< DistanceLeft << " " << CoinLeft << "\n"
				<< "right: "<< DistanceRight << " " << CoinRight << "\n" << std::endl;
			throw;
		}*/

		if (DistanceLeft==DistanceRight || ((CoinLeft == (size_t)-1) && (CoinRight == (size_t)-1))) {
			/*std::cout << "Returning with: " << "\n"
								<< "layout:\n" << Layout << "\n"
								<< "left: "<< DistanceLeft << " " << CoinLeft << "\n"
								<< "right: "<< DistanceRight << " " << CoinRight << "\n" << std::endl;
			*/
			return Output;
		}

		Layout[RobotPos] = '.';
		Output[1]++;

		//std::cout << "Robot at: " << RobotPos << "\n";
		if (DistanceLeft<DistanceRight) {
			RobotPos = CoinLeft;
			Output[0] += DistanceLeft;
			Layout[CoinLeft] = 'R';
		} else {
			RobotPos = CoinRight;
			Output[0] += DistanceRight;
			Layout[CoinRight] = 'R';
		}
		//std::cout << Layout << "\n";
		//std::cout << "Robot at: " << RobotPos << "\n";

		/*
		std::cout << "SearchDepth: " << SearchDepth/2 << "\n";
		std::cout << "CoinLeft: " << CoinLeft << "\n";
		std::cout << "CoinRight: " << CoinRight << "\n";
		std::cout << "Distances: " << DistanceLeft << " " << DistanceRight << "\n\n";
		*/
	}
}

int main () {
	// Input:
	// n rooms
	// Building layout
	// 	e.g.
	// 	20
	// 	**.*......*.R*...*..
	// * = coin; . = empty; R = robot
	int Rooms;
	std::string Layout;
	std::cin >> Rooms;
	std::cin >> Layout;

	// GOAL: Find the max number of coins the robot can collect by always going to
	// the closest coin
	std::vector<int> Output = {0,0};
	Output = CollectCoins(Rooms, Layout, Output);
	int Steps = Output[0];
	int Coins = Output[1];

	std::cout << Steps << " " << Coins << "\n";
}

Test details

Test 1

Group: 1, 2

Verdict: ACCEPTED

input
`1 R` view save

correct output
`0 0` view save

user output
`0 0` view save

Test 2

Group: 1, 2

Verdict: ACCEPTED

input
`10 ...R......` view save

correct output
`0 0` view save

user output
`0 0` view save

Test 3

Group: 1, 2

Verdict: ACCEPTED

input
`10 .R...*` view save

correct output
`12 5` view save

user output
`12 5` view save

Test 4

Group: 1, 2

Verdict: ACCEPTED

input
`10 *R****` view save

correct output
`0 0` view save

user output
`0 0` view save

Test 5

Group: 1, 2

Verdict: ACCEPTED

input
`1000 R................................` view save

correct output
`947 9` view save

user output
`947 9` view save

Test 6

Group: 1, 2

Verdict: ACCEPTED

input
`1000 .................................` view save

correct output
`886 9` view save

user output
`886 9` view save

Test 7

Group: 1, 2

Verdict: ACCEPTED

input
`1000 .........................` view save

correct output
`1287 400` view save

user output
`1287 400` view save

Test 8

Group: 1, 2

Verdict: ACCEPTED

input
`1000 **********.***************...` view save

correct output
`0 0` view save

user output
`0 0` view save

Test 9

Group: 1, 2

Verdict: ACCEPTED

input
`1000 ******************************...` view save

correct output
`0 0` view save

user output
`0 0` view save

Test 10

Group: 1, 2

Verdict: ACCEPTED

input
`1000 R*****************************...` view save

correct output
`999 999` view save

user output
`999 999` view save

Test 11

Group: 1, 2

Verdict: ACCEPTED

input
`1000 ******************************...` view save

correct output
`999 999` view save

user output
`999 999` view save

Test 12

Group: 2

Verdict: ACCEPTED

input
`10000 .......*...................*...` view save

correct output
`10971 999` view save

user output
`10971 999` view save

Test 13

Group: 2

Verdict: ACCEPTED

input
`10000 ...........................` view save

correct output
`9999 999` view save

user output
`9999 999` view save

Test 14

Group: 2

Verdict: ACCEPTED

input
`10000 ...............*.....` view save

correct output
`18766 5000` view save

user output
`18766 5000` view save

Test 15

Group: 2

Verdict: ACCEPTED

input
`10000 R*****************************...` view save

correct output
`9999 9999` view save

user output
`9999 9999` view save

Test 16

Group: 2

Verdict: ACCEPTED

input
`10000 ******************************...` view save

correct output
`9999 9999` view save

user output
`9999 9999` view save

Test 17

Group: 2

Verdict: ACCEPTED

input
`200000 .................................` view save

correct output
`0 0` view save

user output
`0 0` view save

Test 18

Group: 2

Verdict: ACCEPTED

input
`200000 .................................` view save

correct output
`299934 10000` view save

user output
`299934 10000` view save

Test 19

Group: 2

Verdict: ACCEPTED

input
`200000 ............*...*....` view save

correct output
`299998 100000` view save

user output
`299998 100000` view save

Test 20

Group: 2

Verdict: ACCEPTED

input
`200000 ******************************...` view save

correct output
`0 0` view save

user output
`0 0` view save

Test 21

Group: 2

Verdict: ACCEPTED

input
`200000 R................................` view save

correct output
`133765 3` view save

user output
`133765 3` view save

Test 22

Group: 2

Verdict: ACCEPTED

input
`200000 R................................` view save

correct output
`199982 5000` view save

user output
`199982 5000` view save

Test 23

Group: 2

Verdict: ACCEPTED

input
`200000 R*****************************...` view save

correct output
`199999 199999` view save

user output
`199999 199999` view save

Test 24

Group: 2

Verdict: ACCEPTED

input
`200000 ******************************...` view save

correct output
`199999 199999` view save

user output
`199999 199999` view save

Datatähti 2025 alku

Robotti

Compiler report

Code

Test details

Test 1

Test 2

Test 3

Test 4

Test 5

Test 6

Test 7

Test 8

Test 9

Test 10

Test 11

Test 12

Test 13

Test 14

Test 15

Test 16

Test 17

Test 18

Test 19

Test 20

Test 21

Test 22

Test 23

Test 24

Tasks

Submissions (TNT)