Submission #467278

#	Time	Username	Problem	Language	Result	Execution time	Memory
467278		maomao90	Dango Maker (JOI18_dango_maker)	C++17	13 / 100	1 ms	332 KiB

dango_maker

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

template <class T>
inline bool mnto(T& a, T b) {return a > b ? a = b, 1 : 0;}
template <class T>
inline bool mxto(T& a, T b) {return a < b ? a = b, 1: 0;}
#define REP(i, s, e) for (int i = s; i < e; i++)
#define RREP(i, s, e) for (int i = s; i >= e; i--)
typedef long long ll;
typedef long double ld;
#define MP make_pair
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
#define MT make_tuple
typedef tuple<int, int, int> iii;
#define ALL(_a) _a.begin(), _a.end()
#define pb push_back
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;

#ifdef DEBUG
#define debug(args...) _debug(args)
void _debug(const char* format, ...) {
	va_list args;
	va_start(args, format);
	vprintf(format, args);
	va_end(args);
}
#else
#define debug(args...)
#endif

#define INF 1000000005
#define LINF 1000000000000000005
#define MOD 1000000007
#define MAXN 3005

int n, m;
char s[MAXN][MAXN];
bool used[MAXN][MAXN];
int ans;

int main() {
	scanf("%d%d", &n, &m);
	REP (i, 0, n) {
		scanf(" %s", s[i]);
	}
	REP (i, 0, n) {
		REP (j, 0, m) {
			char a = s[i][j], b, c;
			bool put = 0;
			if (j < m - 2) {
				int cnt = 0;
				b = s[i][j + 1], c = s[i][j + 2];
				if (a == 'R' && b == 'G' && c == 'W') {
					cnt += used[i][j + 1];
					cnt += used[i][j + 2];
					if (cnt == 1) {
						if (used[i][j + 1]) {
							used[i + 1][j + 1] = 0;
						}
						ans--;
					}
					if (cnt <= 1) {
						used[i][j] = 1;
						used[i][j + 1] = 1;
						used[i][j + 2] = 1;
						put = 1;
						ans++;
					}
				}
			}
			if (put) continue;
			if (i < n - 2) {
				b = s[i + 1][j], c = s[i + 2][j];
				if (a == 'R' && b == 'G' && c == 'W') {
					assert(!used[i][j]);
					ans++;
					used[i][j] = used[i + 1][j] = used[i + 2][j] = 1;
				}
			}
		}
	}
	printf("%d\n", ans);
	return 0;
}

/*
3 4
RGWR
GRGG
RGWW

4 4
RGWR
GRRG
WGGW
WWWR

5 5
RGRGW
GRRGW
WGGWR
RWRGW
RGWGW
*/

Compilation message (stderr)

dango_maker.cpp: In function 'int main()':
dango_maker.cpp:48:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |  scanf("%d%d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~
dango_maker.cpp:50:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |   scanf(" %s", s[i]);
      |   ~~~~~^~~~~~~~~~~~~

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