Submission #402736

#	Time	Username	Problem	Language	Result	Execution time	Memory
402736		cpp219	Dango Maker (JOI18_dango_maker)	C++14	100 / 100	720 ms	83520 KiB

dango_maker

#pragma GCC optimization "O2"
#pragma GCC optimization "unroll-loop"
#pragma GCC target ("avx2")

#include <bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
using namespace std;
const ll N = 6e3 + 16;
const ll Log2 = 19;
const ll inf = 1e9 + 7;
typedef pair<ll,ll> LL;
///Road to EF/M

char a[N][N];
ll n,m,ans;
ll dx[3] = {0,1,0};
ll dy[3] = {0,0,1};
bool aval[N][N][5];

bool chk(ll x,ll y,ll dir){
    ll A2 = x + dx[dir],B2 = y + dy[dir];
    ll A1 = x - dx[dir],B1 = y - dy[dir];
    return a[A1][B1] == 'R' && a[A2][B2] == 'W' && a[x][y] == 'G';
}

ll dp[N][3],dia;

ll f(ll row,ll prv){
    if (row == dia) return 0;
    if (dp[row][prv] != -1) return dp[row][prv];
    ll ans = f(row + 1,0);
    if (!prv){
        if (aval[row][dia - row][1]) ans = max(ans,1 + f(row + 1,1));
        if (aval[row][dia - row][2]) ans = max(ans,1 + f(row + 1,2));
    }
    if (prv == 1){
        if (aval[row][dia - row][1]) ans = max(ans,1 + f(row + 1,1));
    }
    if (prv == 2){
        if (aval[row][dia - row][2]) ans = max(ans,1 + f(row + 1,2));
    }
    return dp[row][prv] = ans;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    #define task "tst"
    if (fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        //freopen(task".out", "w", stdout);
    }
    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++){
            aval[i][j][1] = chk(i,j,1);
            aval[i][j][2] = chk(i,j,2);
        }
    //cout<<aval[3][2][2]; return 0;
    for (ll i = 2;i <= n + m;i++){
        memset(dp,-1,sizeof(dp)); dia = i;
        ans += f(1,0);
    }
    cout<<ans;
}

Compilation message (stderr)

dango_maker.cpp:1: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    1 | #pragma GCC optimization "O2"
      | 
dango_maker.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization "unroll-loop"
      | 
dango_maker.cpp: In function 'int main()':
dango_maker.cpp:53:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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