/*
Idea:
- http://codeforces.com/blog/entry/57637?#comment-413356 (Problem 3)
*/
// debug 11.35
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define INF (1 << 30)
#define MOD (1000 * 1000 * 1000 + 7)
#define maxn 3111
typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> pii;
char str[maxn][maxn];
int dp[maxn][maxn][3];
int n, m;
bool can(int x, int y, char c){
if(x < 1 || x > n || y < 1 && y > m)
return 0;
return (str[x][y] == c);
}
int fun(int x, int y, int t){ // 0 - nothing, 1 - horizontal, 2 - vertical
if(x < 1 || x > n || y < 1 && y > m)
return 0;
int &cur = dp[x][y][t];
if(cur != -1)
return cur;
int add = 0;
if(t == 1 && can(x, y - 1, 'R') && can(x, y, 'G') && can(x, y + 1, 'W'))
add = 1;
if(t == 2 && can(x - 1, y, 'R') && can(x, y, 'G') && can(x + 1, y, 'W'))
add = 1;
cur = 0;
if(t != 0 && add == 0){
return cur;
for(int i = 0; i < 3; i++){
if(t + i == 3)
continue;
cur = max(cur, fun(x - 1, y + 1, i) + add);
}
return cur;
}
int main(){
scanf("%d%d", &n, &m);
memset(dp, -1, sizeof(dp));
for(int i = 1; i <= n; i++)
scanf("%s", str[i] + 1);
int ans = 0;
for(int i = 1; i <= n; i++){
int tren = max(fun(i, 1, 0), max(fun(i, 1, 1), fun(i, 1, 2)));
ans += tren;
// cout << i << " 1:" << tren << endl;
}
for(int i = 2; i <= m; i++){
ans += max(fun(n, i, 0), max(fun(n, i, 1), fun(n, i, 2)));
// cout << i << " 1:" << tren << endl;
}
printf("%d\n", ans);
return 0;
}
Compilation message
dango_maker.cpp: In function 'bool can(int, int, char)':
dango_maker.cpp:29:29: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
if(x < 1 || x > n || y < 1 && y > m)
~~~~~~^~~~~~~~
dango_maker.cpp: In function 'int fun(int, int, int)':
dango_maker.cpp:36:29: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
if(x < 1 || x > n || y < 1 && y > m)
~~~~~~^~~~~~~~
dango_maker.cpp:63:11: error: a function-definition is not allowed here before '{' token
int main(){
^
dango_maker.cpp:84:1: error: expected '}' at end of input
}
^
dango_maker.cpp:84:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
