#include <bits/stdc++.h> using namespace std; #define REP(i,a,b) for (int i = (a); i <= (b); ++i) #define REPD(i,a,b) for (int i = (a); i >= (b); --i) #define FORI(i,n) REP(i,1,n) #define FOR(i,n) REP(i,0,int(n)-1) #define mp make_pair #define pb push_back #define pii pair<int,int> #define vi vector<int> #define ll long long #define SZ(x) int((x).size()) #define DBG(v) cerr << #v << " = " << (v) << endl; #define FOREACH(i,t) for (typeof(t.begin()) i=t.begin(); i!=t.end(); i++) #define fi first #define se second const int N = 666; const int mod = 1000000007; char s[N][N]; char t[N*2]; int dp[N*2][N*2]; int run(int m) { dp[0][0] = 1; int pvl = 0, pvr = 0, cb = 0; FORI(k,m) { if (t[k] == 'L') cb++; FOR(b,cb+1) { dp[k][b] = dp[k-1][b]; if (t[k] == 'L') { if (b > 0) { dp[k][b] += dp[k-1][b-1]; if (dp[k][b] >= mod) dp[k][b] -= mod; if (pvl > 0) dp[k][b] += mod - dp[pvl-1][b-1]; if (dp[k][b] >= mod) dp[k][b] -= mod; } } else { dp[k][b] += dp[k-1][b+1]; if (dp[k][b] >= mod) dp[k][b] -= mod; if (pvr > 0) dp[k][b] += mod - dp[pvr-1][b+1]; if (dp[k][b] >= mod) dp[k][b] -= mod; } } if (t[k] == 'L') pvl = k; else pvr = k; dp[k][cb+1] = 0; } int ans = (dp[m-1][0]+mod-1)%mod; FORI(k,m) FOR(b,cb+1) dp[k][b] = 0; return ans; } int main() { int n; scanf("%d", &n); FOR(i,n) scanf("%s", s[i]); FOR(i,n) { FOR(j,n) { int m = 1; for (int k = 0; s[i][k]; k++) t[m++] = s[i][k]; for (int k = 0; s[j][k]; k++) t[m++] = s[j][k]; printf("%d ", run(m)); } printf("\n"); } return 0; }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | #include <bits/stdc++.h> using namespace std; #define REP(i,a,b) for (int i = (a); i <= (b); ++i) #define REPD(i,a,b) for (int i = (a); i >= (b); --i) #define FORI(i,n) REP(i,1,n) #define FOR(i,n) REP(i,0,int(n)-1) #define mp make_pair #define pb push_back #define pii pair<int,int> #define vi vector<int> #define ll long long #define SZ(x) int((x).size()) #define DBG(v) cerr << #v << " = " << (v) << endl; #define FOREACH(i,t) for (typeof(t.begin()) i=t.begin(); i!=t.end(); i++) #define fi first #define se second const int N = 666; const int mod = 1000000007; char s[N][N]; char t[N*2]; int dp[N*2][N*2]; int run(int m) { dp[0][0] = 1; int pvl = 0, pvr = 0, cb = 0; FORI(k,m) { if (t[k] == 'L') cb++; FOR(b,cb+1) { dp[k][b] = dp[k-1][b]; if (t[k] == 'L') { if (b > 0) { dp[k][b] += dp[k-1][b-1]; if (dp[k][b] >= mod) dp[k][b] -= mod; if (pvl > 0) dp[k][b] += mod - dp[pvl-1][b-1]; if (dp[k][b] >= mod) dp[k][b] -= mod; } } else { dp[k][b] += dp[k-1][b+1]; if (dp[k][b] >= mod) dp[k][b] -= mod; if (pvr > 0) dp[k][b] += mod - dp[pvr-1][b+1]; if (dp[k][b] >= mod) dp[k][b] -= mod; } } if (t[k] == 'L') pvl = k; else pvr = k; dp[k][cb+1] = 0; } int ans = (dp[m-1][0]+mod-1)%mod; FORI(k,m) FOR(b,cb+1) dp[k][b] = 0; return ans; } int main() { int n; scanf("%d", &n); FOR(i,n) scanf("%s", s[i]); FOR(i,n) { FOR(j,n) { int m = 1; for (int k = 0; s[i][k]; k++) t[m++] = s[i][k]; for (int k = 0; s[j][k]; k++) t[m++] = s[j][k]; printf("%d ", run(m)); } printf("\n"); } return 0; } |