Submission #519039

#	Time	Username	Problem	Language	Result	Execution time	Memory
519039		AdamGS	Miners (IOI07_miners)	C++17	100 / 100	340 ms	508 KiB

miners

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
const int INF=1e9+7;
int dp[4][4][4][4], tmp[4][4][4][4], T[3];
int ile(int a, int b, int c) {
	T[0]=a;
	T[1]=b;
	T[2]=c;
	if(T[2]<T[1]) swap(T[2], T[1]);
	if(T[1]<T[0]) swap(T[0], T[1]);
	if(T[2]<T[1]) swap(T[2], T[1]);
	int ans=1;
	if(T[0]==0) ans=0;
	if(T[1]!=T[0]) ++ans;
	if(T[2]!=T[1]) ++ans;
	return ans;
}
int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	int n;
	string s;
	cin >> n >> s;
	rep(a, 4) rep(b, 4) rep(c, 4) rep(d, 4) dp[a][b][c][d]=-INF;
	dp[0][0][0][0]=0;
	for(auto i : s) {
		rep(a, 4) rep(b, 4) rep(c, 4) rep(d, 4) tmp[a][b][c][d]=-INF;
		rep(a, 4) rep(b, 4) rep(c, 4) rep(d, 4) {
			int x=1;
			if(i=='F') x=2;
			else if(i=='B') x=3;
			tmp[a][b][d][x]=max(tmp[a][b][d][x], dp[a][b][c][d]+ile(c, d, x));
			tmp[b][x][c][d]=max(tmp[b][x][c][d], dp[a][b][c][d]+ile(a, b, x));
		}
		rep(a, 4) rep(b, 4) rep(c, 4) rep(d, 4) dp[a][b][c][d]=tmp[a][b][c][d];
	}
	int ans=0;
	rep(a, 4) rep(b, 4) rep(c, 4) rep(d, 4) ans=max(ans, dp[a][b][c][d]);
	cout << ans << '\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