Submission #201345

#	Time	Username	Problem	Language	Result	Execution time	Memory
201345		abil	Dango Maker (JOI18_dango_maker)	C++14	13 / 100	6 ms	504 KiB

dango_maker

#include <bits/stdc++.h>

#define fr first
#define sc second
#define pb push_back
#define sz(s) s.size()
#define all(s) s.begin(),s.end()
//#define int long long

using namespace std;

const int N = (3e3 + 12);
const int mod = (1e9 + 7);
const int inf = (1e9 + 7);

int dp[N][N], cnt[N][N];
char a[N][N];

main(){
	int n, m;
	scanf("%d%d", &n, &m);
	for(int i = 1;i <= n; i++){
		for(int j = 1;j <= m; j++){
			scanf(" %c", &a[i][j]);
		}
	}
	for(int i = 1;i <= n; i++){
		for(int j = 1;j <= m; j++){
			int x = 0, y = 0;
			if(j >= 3){
				if(a[i][j] == 'W' && a[i][j - 1] == 'G' && a[i][j - 2] == 'R'){
					y++;
				}
			}
			if(i >= 3){
				if(a[i][j] == 'W' && a[i - 1][j] == 'G' && a[i - 2][j] == 'R'){
					x++;
				}
			}
			if((dp[i - 1][j] + x + dp[i][j - 1] - dp[i - 1][j - 1]) >= (dp[i][j - 1] + y + dp[i - 1][j] - dp[i - 1][j - 1])){
				dp[i][j] = (dp[i - 1][j] + x + dp[i][j - 1]) - dp[i - 1][j - 1];
				if(x){
					cnt[i][j]--;
					cnt[i - 1][j]--;
					cnt[i - 2][j]--;				
				}
			}
			else{
				dp[i][j] = (dp[i][j - 1] + y + dp[i - 1][j]) - dp[i - 1][j - 1];
				if(y){
					cnt[i][j]--;
					cnt[i][j - 1]--;
					cnt[i][j - 2]--;				
				}
			}
		}
	}
	for(int i = 1;i <= n; i++){
		for(int j = 1;j <= m; j++){
			if(cnt[i][j] < 0){
				dp[n][m] += cnt[i][j] + 1;
			}
		}
	}
	cout << dp[n][m];
}

Compilation message (stderr)

dango_maker.cpp:19:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
dango_maker.cpp: In function 'int main()':
dango_maker.cpp:21:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~
dango_maker.cpp:24:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf(" %c", &a[i][j]);
    ~~~~~^~~~~~~~~~~~~~~~~

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