Submission #1262177

#	Time	Username	Problem	Language	Result	Execution time	Memory
1262177		Bui_Quoc_Cuong	Dango Maker (JOI18_dango_maker)	C++20	100 / 100	134 ms	9292 KiB

dango_maker

#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=a;i<=(int)b;i++)
#define FORD(i,a,b) for(int i=a;i>=(int)b;i--)
#define fi first
#define se second
#define pb push_back
#define ALL(A) A.begin(), A.end()
#define BIT(mask,i) ((mask>>(i))&1)
template <class A, class B> bool maximize(A &a, const B b) {if(a<b){a = b;return 1;} return 0;}
template <class A, class B> bool minimize(A &a, const B b) {if(a>b){a = b;return 1;} return 0;}
int n,m;
char a[3005][3005];
void init()
{
    cin >> n >> m;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            cin >> a[i][j];
        }
    }
}
void process()
{
    int ans = 0;
    for(int c = 1; c <= n + m; c++)
    {
        vector <int> f1(m + 6, 0);
        vector <int> f2(m + 6, 0);
        int mx = 0;
        for(int j = min(m, c - 1), i = c - j; j >= 1 && i <= n; j--, i++)
        {
            f1[j] = max(f1[j + 1], f2[j + 3]) + (a[i][j] == 'R' && a[i][j + 1] == 'G' && a[i][j + 2] == 'W');
            f2[j] = max(f1[j + 1], f2[j + 1]) + (a[i][j] == 'R' && a[i + 1][j] == 'G' && a[i + 2][j] == 'W');
            maximize(mx, max(f1[j], f2[j]));
        }
        ans+= mx;
    }
    cout << ans;
}
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    #define Hori "dango"
    if(fopen(Hori".inp", "r"))
    {
        freopen(Hori".inp", "r", stdin);
        freopen(Hori".out", "w", stdout);
    }
    init();
    process();
    return 0;
}
/*
3 4
RGWR
GRGG
RGWW
*/

Compilation message (stderr)

dango_maker.cpp: In function 'int main()':
dango_maker.cpp:50:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |         freopen(Hori".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
dango_maker.cpp:51:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |         freopen(Hori".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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