Submission #65503330

Source Code Expand

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#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int T;
    cin >> T;
    while(T--){
        ll H, W;
        string S;
        cin >> H >> W >> S;
        ll N = H + W - 2;
        ll Dtot = 0, Qtot = 0;
        for(char c: S){
            if(c=='D') Dtot++;
            else if(c=='?') Qtot++;
        }
        ll U = (H - 1) - Dtot;
        if(U < 0 || U > Qtot){
 
 
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#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int T;
    cin >> T;
    while(T--){
        ll H, W;
        string S;
        cin >> H >> W >> S;
        ll N = H + W - 2;
        ll Dtot = 0, Qtot = 0;
        for(char c: S){
            if(c=='D') Dtot++;
            else if(c=='?') Qtot++;
        }
        ll U = (H - 1) - Dtot;
        if(U < 0 || U > Qtot){
            cout << 0 << "\n";
            continue;
        }
        vector<ll> preD(N+1,0), preQ(N+1,0);
        for(int i = 0; i < N; i++){
            preD[i+1] = preD[i] + (S[i] == 'D');
            preQ[i+1] = preQ[i] + (S[i] == '?');
        }
        ll ans = 0;
        for(ll i = 0; i <= N; i++){
            ll sufQ = Qtot - preQ[i];
            ll low = preD[i] + max(0LL, U - sufQ);
            low = max(low, i - (W - 1));
            ll high = preD[i] + min(preQ[i], U);
            if(low <= high){
                ans += high - low + 1;
            }
        }
        cout << ans << "\n";
    }
    return 0;
}

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