Submission #468070

#	Time	Username	Problem	Language	Result	Execution time	Memory
468070		jamezzz	Dango Maker (JOI18_dango_maker)	C++17	100 / 100	914 ms	115108 KiB

dango_maker

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

#ifdef DEBUG
#define dbg(...) printf(__VA_ARGS__);
#else
#define dbg(...)
#endif
#define sf scanf
#define pf printf
#define fi first
#define se second
#define pb emplace_back
#define ppb pop_back
#define sz(x) (int)x.size()
#define mnto(x,y) x=min(x,(__typeof__(x))y)
#define mxto(x,y) x=max(x,(__typeof__(x))y)
#define INF 1023456789
#define LINF 1023456789123456789
#define all(x) x.begin(), x.end()
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> iii;
typedef tuple<int, int, int, int> iiii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<pll> vll;
mt19937 rng(time(0));

int n,m,g[3005][3005];
int dp[3005][3005][2];
char c;

int can(int i,int j,int o){
	if(o)return g[i-1][j]==1&&g[i][j]==2&&g[i+1][j]==3;
	else return g[i][j-1]==1&&g[i][j]==2&&g[i][j+1]==3;
}

int main(){
	sf("%d%d",&n,&m);
	for(int i=1;i<=n;++i){
		for(int j=1;j<=m;++j){
			sf(" %c",&c);
			if(c=='R')g[i][j]=1;
			if(c=='G')g[i][j]=2;
			if(c=='W')g[i][j]=3;
		}
	}
	
	for(int i=1;i<=n;++i){
		for(int j=1;j<=m;++j){
			dp[i][j][0]=dp[i][j][1]=-INF;
		}
	}
	
	int ans=0;
	for(int i=2;i<=n+m;++i){ //process by diagonal
		int mx=0;
		int X=-1,Y=-1;
		for(int x=max(1,i-m);x<=min(n,i-1);++x){
			int y=i-x;
			for(int a=0;a<2;++a){
				if(can(x,y,a)){
					dp[x][y][a]=max(mx,dp[x-1][y+1][a])+1;
					//put horizontal/vertical, then transition to previous
					//mx is if u dont put
				}
			}
			for(int a=0;a<2;++a){
				mx=max(mx,dp[x-1][y+1][a]);
				//update mx to put horizontal/vertical at previous
			}
			X=x;Y=y;
		}
		for(int a=0;a<2;++a){
			mx=max(mx,dp[X][Y][a]);
		}
		ans+=mx;
	}
	
	printf("%d\n",ans);
}

Compilation message (stderr)

dango_maker.cpp: In function 'int main()':
dango_maker.cpp:42:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |  sf("%d%d",&n,&m);
      |    ^
dango_maker.cpp:45:6: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |    sf(" %c",&c);
      |      ^

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