Submission #831477

#	Time	Username	Problem	Language	Result	Execution time	Memory
831477		OrazB	Miners (IOI07_miners)	C++14	0 / 100	1575 ms	1728 KiB

miners

#include <bits/stdc++.h>
using namespace std;
#define all(x) (x).begin(), (x).end()
#define ll long long int
#define pii pair <int, int>
#define pb push_back
#define ff first
#define ss second

const int N = 1e5+5;

int nw[26], A[3], vis[N];
pair<int,pii> dp[N][5];

int T(char c){
	if (c == 'M') return 0;
	if (c == 'B') return 1;
	return 2;
}

int main ()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n;
	string s;
	cin >> n >> s;
	int mx = 0, x = 0, y = 0;
	for (int i = 1; i < n; i++){
		for (int j = i-1; j >= 0; j--){
		
			int p = T(s[j]);

			for (int k = 0; k < 3; k++){
				if (dp[j][k].ff == 0) continue;
				A[k] = 1;
				A[T(s[i])] = 1;
				A[p] = 1;
				int cnt = (A[0]+A[1]+A[2]);
				if (dp[i][p].ff < cnt+dp[j][k].ff){
					dp[i][p] = {cnt+dp[j][k].ff, {j, k}};
				}
				A[0] = A[1] = A[2] = 0;
			}

			if (dp[i][p].ff < (s[i]!=s[j])+2){
				dp[i][p] = {(s[i]!=s[j])+2, {j, -1e9}};
			}

			if (mx <= dp[i][p].ff){
				mx = dp[i][p].ff;
				x = i;
				y = p;
			}
		}
	}
	int ans = 0;
	ans += mx;
	while(1){
		vis[x] = 1;
		if (x == 0) break;
		int new_x, new_y;
		new_x = dp[x][y].ss.ff;
		new_y = dp[x][y].ss.ss;
		x = new_x;
		y = new_y;
	}
	string str = "";
	for (int i = 0; i < n; i++) if (vis[i] == 0) str += s[i];
	for (int i = 0; i < str.size(); i++){
		for (int j = i; j > max(i-3, -1); j--){
			A[T(str[j])] = 1;	
		}
		ans += A[0]+A[1]+A[2];
		A[0] = A[1] = A[2] = 0;
	}
	cout << ans << '\n';
}	

Compilation message (stderr)

miners.cpp: In function 'int main()':
miners.cpp:70:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |  for (int i = 0; i < str.size(); i++){
      |                  ~~^~~~~~~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 9
• Subtask 3: 0 / 9
• Subtask 4: 0 / 9
• Subtask 5: 0 / 9
• Subtask 6: 0 / 7
• Subtask 7: 0 / 8
• Subtask 8: 0 / 8
• Subtask 9: 0 / 8
• Subtask 10: 0 / 8
• Subtask 11: 0 / 8
• Subtask 12: 0 / 8