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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#94929 | #5576. Advertising ICPC | Nicolas125841 | TL | 2ms | 4444kb | C++14 | 3.9kb | 2023-04-08 12:52:55 | 2023-04-08 12:52:57 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll mod = 98244353;
ll euclid(ll a, ll b, ll &x, ll &y) {
if (!b) return x = 1, y = 0, a;
ll d = euclid(b, a % b, y, x);
return y -= a/b * x, d;
}
struct Mod {
ll x;
Mod() { x = 0; }
Mod(ll xx) : x(xx) {}
Mod operator+(Mod b) { return Mod((x + b.x) % mod); }
Mod operator-(Mod b) { return Mod((x - b.x + mod) % mod); }
Mod operator*(Mod b) { return Mod((x * b.x) % mod); }
Mod operator/(Mod b) { return *this * invert(b); }
Mod invert(Mod a) {
ll x, y, g = euclid(a.x, mod, x, y);
assert(g == 1); return Mod((x + mod) % mod);
}
Mod operator^(ll e) {
if (!e) return Mod(1);
Mod r = *this ^ (e / 2); r = r * r;
return e&1 ? *this * r : r;
}
};
Mod dp[8][6561][2];
int mp[8][8], j_vals[8];
unordered_set<int> matches;
int conv(char c){
if(c == 'C')
return 0;
else if(c == 'I')
return 1;
else if(c == 'P')
return 2;
else
return -1;
}
int main(){
cin.tie(NULL)->sync_with_stdio(false);
int n, m;
char tmp;
cin >> n >> m;
int m_max = pow(3, m);
for(int i = 0; i < n; i++){
for(int j = 0; j < m; j++){
cin >> tmp;
mp[i][j] = conv(tmp);
}
}
for(int j = 0; j < m_max; j++){
bool good = true;
int tj = j;
for(int l = 0; l < m; l++){
j_vals[l] = tj%3;
if(mp[0][l] != -1 && mp[0][l] != j_vals[l])
good = false;
tj /= 3;
}
if(good)
dp[0][j][0] = 1;
else
dp[0][j][0] = 0;
dp[0][j][1] = 0;
}
for(int i = 1; i < n; i++){
vector<vector<int>> adds(7, vector<int>());
Mod sum0 = 0, sum1 = 0;
for(int j = 0; j < m_max; j++){
bool good = true;
int tj = j;
sum0 = sum0 + dp[i-1][j][0];
sum1 = sum1 + dp[i-1][j][1];
for(int l = 0; l < m; l++){
j_vals[l] = tj%3;
if(mp[i-1][l] != -1 && mp[i-1][l] != j_vals[l])
good = false;
tj /= 3;
}
if(good){
for(int l = 0; l < m-1; l++){
if(j_vals[l] == 1 && j_vals[l+1] == 0)
adds[l].push_back(j);
}
}
}
for(int j = 0; j < m_max; j++){
bool good = true;
int tj = j;
for(int l = 0; l < m; l++){
j_vals[l] = tj%3;
if(mp[i][l] != -1 && mp[i][l] != j_vals[l])
good = false;
tj /= 3;
}
matches.clear();
dp[i][j][0] = dp[i][j][1] = 0;
if(good){
for(int l = 0; l < m-1; l++){
if(j_vals[l] == 2 && j_vals[l+1] == 0){
for(int v : adds[l]){
matches.insert(v);
}
}
}
Mod tsum0 = sum0;
Mod tsum1 = sum1;
for(int v : matches){
tsum0 = tsum0 - dp[i-1][v][0];
tsum1 = tsum1 - dp[i-1][v][1];
dp[i][j][1] = dp[i][j][1] + dp[i-1][v][0] + dp[i-1][v][1];
}
dp[i][j][0] = dp[i][j][0] + tsum0;
dp[i][j][1] = dp[i][j][1] + tsum1;
}
}
}
Mod ans = 0;
for(int i = 0; i < m_max; i++){
ans = ans + dp[n-1][i][1];
}
cout << ans.x << "\n";
}
//????????
详细
Test #1:
score: 100
Accepted
time: 2ms
memory: 4292kb
input:
3 3 ??? ?I? ???
output:
243
result:
ok single line: '243'
Test #2:
score: 0
Accepted
time: 2ms
memory: 4444kb
input:
2 2 IC PC
output:
1
result:
ok single line: '1'
Test #3:
score: -100
Time Limit Exceeded
input:
8 8 ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????