Submission #919744

#	Time	Username	Problem	Language	Result	Execution time	Memory
919744		penguin133	Miners (IOI07_miners)	C++17	100 / 100	172 ms	113648 KiB

miners

#include <bits/stdc++.h>
using namespace std;

//#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

int memo[100005][4][4][4][4], n;
int A[100005];

int dp(int x, int ls, int ls2, int pr, int pr2){
	if(x == n + 1)return 0;
	if(memo[x][ls][ls2][pr][pr2] != -1)return memo[x][ls][ls2][pr][pr2];
	int tmp = 0;
	if(ls == 1 || ls2 == 1 || A[x] == 1)tmp++;
	if(ls == 2 || ls2 == 2 || A[x] == 2)tmp++;
	if(ls == 3 || ls2 == 3 || A[x] == 3)tmp++;
	tmp += dp(x + 1, A[x], ls, pr, pr2);
	int tmp2 = 0;
	if(pr == 1 || pr2 == 1 || A[x] == 1)tmp2++;
	if(pr == 2 || pr2 == 2 || A[x] == 2)tmp2++;
	if(pr == 3 || pr2 == 3 || A[x] == 3)tmp2++;
	tmp2 += dp(x + 1, ls, ls2, A[x], pr);
	return memo[x][ls][ls2][pr][pr2] = max(tmp, tmp2);
}

void solve(){
	cin >> n;
	for(int i = 1; i <= n; i++){
		char x; cin >> x;
		if(x == 'M')A[i] = 1;
		if(x == 'B')A[i] = 2;
		if(x == 'F')A[i] = 3;
	}
	memset(memo, -1, sizeof(memo));
	cout << dp(1, 0, 0, 0, 0) << '\n';
}

main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int tc = 1;
	//cin >> tc;
	for(int tc1=1;tc1<=tc;tc1++){
		// cout << "Case #" << tc1 << ": ";
		solve();
	}
}

Compilation message (stderr)

miners.cpp:45:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   45 | main(){
      | ^~~~

• 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