Submission #914777

#	Time	Username	Problem	Language	Result	Execution time	Memory
914777		May27_th	Dango Maker (JOI18_dango_maker)	C++17	0 / 100	1 ms	2512 KiB

dango_maker

#include <bits/stdc++.h>
#define int64_t long long
#define double long double
using namespace std;
using type = int64_t;
const long long mod = 1000000007, inf = 1e18;
const int base = 33;
const int N = 2e5 + 10;
const int LG = 20;

int dx[] = {1, -1, 0, 0};
int dy[] = {0, 0, 1, -1};

void Minimize(int64_t &a, int64_t b) {if(b < a) a = b;}
void Maximize(int &a, int b) {if(b > a) a = b;}
void Add(int64_t& a, int64_t b) {a = a + b; a %= mod;}
void Dec(int64_t& a, int64_t b) {a = a - b + mod; a %= mod;}

int n, m; char d[3005][3005]; int f[3005][3004];
bool h(int i, int j)
{
    return (d[i][j] == 'W') && (d[i][j - 1] == 'G') && (d[i][j - 2] == 'R');
}
bool v(int i, int j)
{
    return (d[i][j] == 'W') && (d[i - 1][j] == 'G') && (d[i - 2][j] == 'R');
}
void Solve(void)
{
    /**
        tim so cach xien que sao cho thu tu la R, G, W
    **/
    cin >> n >> m;
    for(int i = 1; i <= n; i ++){
        for(int j = 1; j <= m; j ++){
            cin >> d[i][j];
        }
    }
    for(int i = 1; i <= n; i ++){
        for(int j = 1; j <= m; j ++){
            f[i][j] = f[i - 1][j];
            Maximize(f[i][j], f[i][j - 1]);
            if(j >= 3){
                Maximize(f[i][j], f[i][j - 3] + f[i - 1][j] - f[i - 1][j - 3]);
                if(h(i, j)){
                    Maximize(f[i][j], 1 + f[i][j - 3] + f[i - 1][j] - f[i - 1][j - 3]);
                }
            }
            if(i >= 3){
                Maximize(f[i][j], f[i][j - 1] + f[i - 3][j] - f[i - 3][j - 1]);
                if(v(i, j)){
                    Maximize(f[i][j], 1 + f[i][j - 1] + f[i - 3][j] - f[i - 3][j - 1]);
                }
            }
            //cout << f[i][j] << " ";
        }
        //cout << "\n";
    }
    cout << max(f[n][m], f[n - 1][m] + f[n][m - 1] - f[n - 1][m - 1]);
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    if(fopen("poetry.in", "r")){
        freopen("poetry.in", "r", stdin);
        freopen("poetry.out", "w", stdout);
    }
    if(fopen("A.inp", "r")){
        freopen("A.inp", "r", stdin);
        freopen("A.out", "w", stdout);
    }
    int tc = 1;
    //cin >> tc;
    while(tc --){
        Solve();
    }
}

Compilation message (stderr)

dango_maker.cpp: In function 'int main()':
dango_maker.cpp:67:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |         freopen("poetry.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
dango_maker.cpp:68:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         freopen("poetry.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
dango_maker.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen("A.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
dango_maker.cpp:72:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |         freopen("A.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 67