Submission #1117451

#	Time	Username	Problem	Language	Result	Execution time	Memory
1117451		trinhvtuan	Miners (IOI07_miners)	C++17	100 / 100	496 ms	118340 KiB

miners

#include <bits/stdc++.h>
using namespace std;
int c,d,x,y,z,n;
int i,j,k;
typedef pair<int,int>i2;
string s;
int a[200005],f[200005][4][4][4][4];
long long dp(int id,i2 x,i2 y)
{
    if (id>n) return 0;
    if (f[id][x.first+1][x.second+1][y.first+1][y.second+1]!=-1) return
    f[id][x.first+1][x.second+1][y.first+1][y.second+1];
    vector<int>b; int d=0;
    b.push_back(x.first);
    b.push_back(x.second);
    b.push_back(a[id]);
    sort(b.begin(),b.end());
    d=1;
    for (int i=1;i<b.size();i++)
    if (b[i]!=b[i-1]) d++;
    if (b[0]==-1) d--;
    long long ans=dp(id+1,{x.second,a[id]},y)+d;
    b.clear();
    b.push_back(y.first);
    b.push_back(y.second);
    b.push_back(a[id]);
    sort(b.begin(),b.end());
    d=1;
    for (int i=1;i<b.size();i++)
    if (b[i]!=b[i-1]) d++;
    if (b[0]==-1) d--;
    ans=max(ans,dp(id+1,x,{y.second,a[id]})+d);
    return f[id][x.first+1][x.second+1][y.first+1][y.second+1]=ans;
}
int main()
{
//    freopen("MINERS.INP", "r" ,stdin);
//    freopen("MINERS.OUT", "w" ,stdout);
//    freopen("tongab.inp", "r" ,stdin);
//    freopen("tongab.txt", "w" ,stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin>>n;
    for (int i=1;i<=n;i++)
    for (int x1=0;x1<=3;x1++)
    for (int x2=0;x2<=3;x2++)
    for (int y1=0;y1<=3;y1++)
    for (int y2=0;y2<=3;y2++)
    f[i][x1][x2][y1][y2]=-1;
    cin>>s; s='0'+s;
    for (int i=1;i<=n;i++)
    if (s[i]=='M') a[i]=0; else
    if (s[i]=='B') a[i]=1; else a[i]=2;
    c=dp(1,{-1,-1},{-1,-1});
    cout<<c;
}

Compilation message (stderr)

miners.cpp: In function 'long long int dp(int, i2, i2)':
miners.cpp:19:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for (int i=1;i<b.size();i++)
      |                  ~^~~~~~~~~
miners.cpp:29:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for (int i=1;i<b.size();i++)
      |                  ~^~~~~~~~~

• 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