Submission #57115

#	Time	Username	Problem	Language	Result	Execution time	Memory
57115		PeppaPig	Miners (IOI07_miners)	C++14	100 / 100	446 ms	1688 KiB

miners

#include <bits/stdc++.h>

using namespace std;

const int N = 1e5 + 5;

int dp[2][4][4][4][4];
int n, arr[N];
string str;

int cnt(int x, int y, int z) {
	int ret = 0;
	for(int i = 1; i <= 3; i++) if(x == i || y == i || z == i) ret++;
	return ret;
}

int main() {
	scanf("%d", &n);
	cin >> str;
	for(int i = 0; i < n; i++) {
		if(str[i] == 'M') arr[i] = 1;
		else if(str[i] == 'F') arr[i] = 2;
		else arr[i] = 3;
	}

	int now = 0;

	for(int k = n - 1; k >= 0; k--) {
		for(int a = 0; a < 4; a++) for(int b = 0; b < 4; b++) for(int c = 0; c < 4; c++) for(int d = 0; d < 4; d++) 
			dp[now][a][b][c][d] = max(dp[1 - now][arr[k]][a][c][d] + cnt(arr[k], a, b), dp[1 - now][a][b][arr[k]][c] + cnt(arr[k], c, d));
		now = 1 - now;
	}	

	printf("%d", dp[1 - now][0][0][0][0]);

	return 0;
}

Compilation message (stderr)

miners.cpp: In function 'int main()':
miners.cpp:18:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 9 / 9
• Subtask 5: 9 / 9
• Subtask 6: 7 / 7
• Subtask 7: 8 / 8
• Subtask 8: 8 / 8
• Subtask 9: 8 / 8
• Subtask 10: 8 / 8
• Subtask 11: 8 / 8
• Subtask 12: 8 / 8