oj.uz

Submission #874854

# Submission time Handle Problem Language Result Execution time Memory
874854 2023-11-18T01:14:55 Z josanneo22 Miners (IOI07_miners) C++17
100 / 100
 88 ms 1116 KB 
/*
Problem: IOI 2007 Miners 
When:    2023-11-13 21:27:07
Author:  JN
*/
#include<bits/stdc++.h>
using namespace std;
 
using i64 = long long;
using pii = pair<int, int>;
#define L(i,j,k) for(int i=(j);i<=(k);++i)
#define R(i,j,k) for(int i=(j);i>=(k);--i)
#define all(x) x.begin(), x.end()
 
int dp[2][4][4][4][4];
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
 
    int n; cin>>n;
    string s; cin>>s;
    vector<int> a(n+1);
    L(i,0,n-1){
        if(s[i]=='M') a[i]=1;
        if(s[i]=='B') a[i]=2;
        if(s[i]=='F') a[i]=3;
    }
    memset(dp,-1,sizeof(dp));
    dp[0][0][0][0][0]=0;
    auto profit=[&](int x,int y,int z){
        if(!x && !y) return 1;
        if(!x) return (y!=z)+1;
        if(x==y && y==z) return 1;
        return (x!=y)+(y!=z)+(z!=x);
    };
    L(i,0,n-1){
        int nw=i&1;int nx=nw^1;
        L(a1,0,3) L(a2,0,3) L(b1,0,3) L(b2,0,3){
            if(dp[nw][a1][a2][b1][b2]==-1) continue;
            dp[nx][a2][a[i]][b1][b2]=max(dp[nx][a2][a[i]][b1][b2], dp[nw][a1][a2][b1][b2]+profit(a1,a2,a[i]));
            dp[nx][a1][a2][b2][a[i]]=max(dp[nx][a1][a2][b2][a[i]], dp[nw][a1][a2][b1][b2]+profit(b1,b2,a[i]));
            // cout<<a1<<' '<<a2<<' '<<b1<<' '<<b2<<' ';
            // cout<<profit(a1,a2,a[i])<<' ';
            // cout<<profit(b1,b2,a[i])<<'\n';
        }
    }
    int ans=0;
    L(a1,0,3) L(a2,0,3) L(b1,0,3) L(b2,0,3){
        if(ans<dp[n&1][a1][a2][b1][b2]){
            ans=dp[n&1][a1][a2][b1][b2];
            //cout<<a1<<' '<<a2<<' '<<b1<<' '<<b2<<'\n';
        }
    }
    cout<<ans<<'\n';
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 456 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct

Subtask #4
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct

Subtask #5
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct

Subtask #6
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct

Subtask #7
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct

Subtask #8
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 348 KB Output is correct

Subtask #9
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 344 KB Output is correct

Subtask #10
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 604 KB Output is correct

Subtask #11
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 63 ms 856 KB Output is correct

Subtask #12
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 88 ms 1116 KB Output is correct