Submission #814983

#	Time	Username	Problem	Language	Result	Execution time	Memory
814983		trucmai	Dango Maker (JOI18_dango_maker)	C++17	100 / 100	274 ms	226176 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],dp[i][1][1],dp[i][1][2]}); 
  for(ll i = 2;i <= m;++i)
    res += max({dp[n][i][0],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:13:12: 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:14:12: 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