Submission #1262360

#	Time	Username	Problem	Language	Result	Execution time	Memory
1262360		icebear	Dango Maker (JOI18_dango_maker)	C++20	100 / 100	144 ms	9292 KiB

dango_maker

// ~~ icebear ~~
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> ii;
typedef pair<int, ii> iii;

template<class T>
    bool minimize(T &a, const T &b) {
        if (a > b) return a = b, true;
        return false;
    }

template<class T>
    bool maximize(T &a, const T &b) {
        if (a < b) return a = b, true;
        return false;
    }

#define FOR(i,a,b) for(int i=(a); i<=(b); ++i)
#define FORR(i,a,b) for(int i=(a); i>=(b); --i)
#define REP(i, n) for(int i=0; i<(n); ++i)
#define RED(i, n) for(int i=(n)-1; i>=0; --i)
#define MASK(i) (1LL << (i))
#define BIT(S, i) (((S) >> (i)) & 1)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define task "icebear"

const int MOD = 1e9 + 7;
const int inf = 1e9 + 27092008;
const ll INF = 1e18 + 27092008;
const int N = 3000 + 5;
int n, m;
char a[N][N];

void init(void) {
    cin >> n >> m;
    FOR(i, 1, n) FOR(j, 1, m) cin >> a[i][j];
}

void process(void) {
    int ans = 0;
    FOR(cross, 1, n + m) {
        vector<array<int, 2>> dp(m + 5, {0, 0});
        int best = 0;
        for(int j = min(cross - 1, m), i = cross - j; j > 0 && i <= n; j--, i++) {
            if (i >= 3)
                dp[j][0] = max(dp[j + 3][1], dp[j + 1][0]) + (a[i][j] == 'W' && a[i - 1][j] == 'G' && a[i - 2][j] == 'R');
            if (j >= 3)
                dp[j][1] = max(dp[j + 1][0], dp[j + 1][1]) + (a[i][j] == 'W' && a[i][j - 1] == 'G' && a[i][j - 2] == 'R');
            maximize(best, max(dp[j][0], dp[j][1]));
        }
        ans += best;
    }
    cout << ans;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int tc = 1;
//    cin >> tc;
    while(tc--) {
        init();
        process();
    }
    return 0;
}

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(task".inp", "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(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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