Submission #815018

#	Time	Username	Problem	Language	Result	Execution time	Memory
815018		trucmai	Dango Maker (JOI18_dango_maker)	C++17	100 / 100	267 ms	221456 KiB

dango_maker

    #include <bits/stdc++.h>
    using namespace std;
     
    #ifdef LOCAL
      #include "/home/trucmai/.vim/tools.h"
      #define debug(x...) cerr << "\e[91m"<<__func__<<":"<<__LINE__<<" [" << #x << "] = ["; _print(x); cerr << "\e[39m" << endl;
      #else
      #define debug(x...)
    #endif
     
    void open(){
      if(fopen("i.inp","r")){
        freopen("i.inp","r",stdin);
        freopen("o.out","w",stdout);
      }
    }
     
    #define ll int
    #define all(a) (a).begin(), (a).end()
    #define vi vector<ll>
    #define pi pair<ll,ll>
    #define pii pair<ll,pair<ll,ll>>
    #define fi first
    #define se second
    #define gcd __gcd
    #define mset(a,v) memset(a, v, sizeof(a))
    #define endl '\n'
    #define spc " "
     
    const int MN = 3001,LOG = 27;
    const ll MOD = 1e9 + 7,INF = 1e9;
    ll n,m,dp[MN][MN][3],dango[MN][MN][3];
    char a[MN][MN];
    void solve(){
      cin>>n>>m; 
      for(ll i = 1;i <= n;++i)
        for(ll j = 1;j <= m;++j) cin>>a[i][j]; 
      for(ll i = 1;i <= n;++i)
        for(ll j = 1;j <= m;++j){
          if(a[i-1][j] == 'R' && a[i][j] == 'G' && a[i+1][j] == 'W') dango[i][j][1] = 1; 
          if(a[i][j-1] == 'R' && a[i][j] == 'G' && a[i][j+1] == 'W') dango[i][j][2] = 1;
        }
      for(ll i = 1;i <= n;++i){
        for(ll j = 1;j <= m;++j){
          dp[i][j][0] += max({dp[i-1][j+1][0],dp[i-1][j+1][1],dp[i-1][j+1][2]});
          dp[i][j][1] += max({dp[i-1][j+1][0],dp[i-1][j+1][1]}) + dango[i][j][1];
          dp[i][j][2] += max({dp[i-1][j+1][0],dp[i-1][j+1][2]}) + dango[i][j][2];
        }
      }
      ll res = 0; 
      for(ll i = 1;i <= n;++i)
        res += max(dp[i][1][0],max(dp[i][1][1],dp[i][1][2])); 
      for(ll i = 2;i <= m;++i)
        res += max(dp[n][i][0],max(dp[n][i][1],dp[n][i][2]));
      cout<<res<<endl;
    }
     
    signed main(){
      cin.tie(0) -> sync_with_stdio(0);
      open();
      ll t = 1; //cin>>t;
      while(t--) solve(); 
      cerr << endl << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
    }

Compilation message (stderr)

dango_maker.cpp: In function 'void open()':
dango_maker.cpp:13:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         freopen("i.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~
dango_maker.cpp:14:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |         freopen("o.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 20 / 20
• Subtask 3: 67 / 67