Submission #293350

#	Time	Username	Problem	Language	Result	Execution time	Memory
293350		Hemimor	Miners (IOI07_miners)	C++14	100 / 100	158 ms	688 KiB

miners

#include <algorithm>
#include <iostream>
#include <iomanip>
#include <numeric>
#include <vector>
#include <cmath>
#include <queue>
#include <set>
#include <map>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<P,int> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-8;
const ll mod=1e9+7;
const int dx[4]={-1,0,1,0},dy[4]={0,-1,0,1};

int f(int i,int j,int k){
	if(j==3) j=i;
	if(k==3) k=i;
	if(i==j&&j==k) return 1;
	if(i==j||j==k||k==i) return 2;
	return 3;
}

int n,dp[4][4][4][4];
string s;

int main(){
	cin>>n>>s;
	for(int i=0;i<4;i++) for(int j=0;j<4;j++) for(int k=0;k<4;k++) for(int l=0;l<4;l++) dp[i][j][k][l]=-inf;
	dp[3][3][3][3]=0;
	for(auto c:s){
		int v;
		if(c=='M') v=0;
		if(c=='F') v=1;
		if(c=='B') v=2;
		int DP[4][4][4][4];
		for(int i=0;i<4;i++) for(int j=0;j<4;j++) for(int k=0;k<4;k++) for(int l=0;l<4;l++) DP[i][j][k][l]=-inf;
		for(int i=0;i<4;i++) for(int j=0;j<4;j++) for(int k=0;k<4;k++) for(int l=0;l<4;l++){
			DP[v][i][k][l]=max(DP[v][i][k][l],dp[i][j][k][l]+f(v,i,j));
			DP[i][j][v][k]=max(DP[i][j][v][k],dp[i][j][k][l]+f(v,k,l));
		}
		swap(dp,DP);
	}
	int res=0;
	for(int i=0;i<4;i++) for(int j=0;j<4;j++) for(int k=0;k<4;k++) for(int l=0;l<4;l++) res=max(res,dp[i][j][k][l]);
	cout<<res<<endl;
}

Compilation message (stderr)

miners.cpp: In function 'int main()':
miners.cpp:40:2: warning: 'v' may be used uninitialized in this function [-Wmaybe-uninitialized]
   40 |  if(i==j&&j==k) return 1;
      |  ^~
miners.cpp:53:7: note: 'v' was declared here
   53 |   int v;
      |       ^

• 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