Submission #5910509

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Source Code Expand

#include <bits/stdc++.h>
#include <vector>
#include <numeric>
#define PI 3.14159265358979323846
#define MAXINF (1e18L)
#define INF (1e9L)
#define EPS (1e-9)
#define MOD (1e9+7)
#define REP(i, n) for(int i=0;i<int(n);++i)
#define Rep(i,sta,n) for(int i=sta;i<n;i++)
#define RREP(i, n) for(int i=int(n)-1;i>=0;--i)
#define ALL(v) v.begin(),v.end()
#define FIND(v,x) (binary_search(ALL(v),(x)))
#define SORT(v) sort(ALL(v))
#define RSORT(v) sort(ALL(v));reverse(ALL(v))
#define DEBUG(x) cerr<<#x<<": "<<x<<endl;
#define DEBUG_VEC(v) cerr<<#v<<":";for(int i=0;i<v.size();i++) cerr<<" "<<v[i]; cerr<<endl
#define Yes(n) cout<<((n)?"Yes":"No")<<endl
#define YES(n) cout<<((n)?"YES":"NO")<<endl
#define pb push_back
#define fi first
#define se second
using namespace std;
template<class A>void pr(A a){cout << (a) << endl;}
template<class A,class B>void pr(A a,B b){cout << a << " "  ;pr(b);}
template<class A,class B,class C>void pr(A a,B b,C c){cout << a << " " ;pr(b,c);}
template<class A,class B,class C,class D>void pr(A a,B b,C c,D d){cout << a << " " ;pr(b,c,d);}
typedef long long ll;
typedef pair<int, int> pii;

int main(void)
{
    string s;
    cin >> s;
    vector<vector<int>> dp(s.size()+1, vector<int>(s.size()+1, 0));

    REP(w, s.size()+1){
        if(w%3!=0)continue;
        REP(l, s.size()+1){
            Rep(r, l+1, s.size()+1){
                for(int i = l; i <= r; ++i) {
                    dp[l][r] = max(dp[l][r], dp[l][i] + dp[i][r]);
                }
                // if(dp[l][l + w] != w) {
                //     continue;
                // }
                for(int d = -2; d <= 1; ++d) {
                    if(l - d < 0 || s.size() < r + 2 - d) {
                        continue;
                    }
                    auto iwi = s.substr(l - d, d) + s.substr(r-1, 3 - d);
                    if(iwi == "iwi") {
                        dp[l - d][r + 2 - d] = dp[l][r] + 3;
                    }
                }
            }

        }
    }
    int ans = 0;
    REP(l, s.size()+1){
        REP(r, s.size()+1){
            ans=max(dp[l][r],ans);
            // cout << dp[l][r] << " ";
        }
        // cout << endl;
    }
    pr(ans/3);
}

Submission Info

Judge Result