Submission #3222734


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

const int MOD = 1e9 + 7;
const int N = 1e5 + 10;

int n, last[3] = {0,-1,-1}, dp[N];
string s;

int main() {
    cin >> s;
    int n = s.size();
    s = ' ' + s;

    dp[0] = 1;
    int sum = 0;
    for (int i = 1; i <= n; i++) {
        int x = s[i]-'a'+1;
        sum += x;
        if (sum >= 3) sum -= 3;

        dp[i] = 0;
        for (int c = 1; c <= 2; c++) {
            int j = last[(sum+3-c)%3];
            if (j >= 0) {
                dp[i] += dp[j];
                if (dp[i] >= MOD) dp[i] -= MOD;
            }
        }
        if (sum == 0) {
            ++dp[i];
            if (dp[i] >= MOD) dp[i] -= MOD;
        }
        last[sum] = i;
    }
    cout << (dp[n] + MOD- (sum == 0)) % MOD << endl;
    return 0;
}

Submission Info

Submission Time
Task E - ABBreviate
User aurinegro
Language C++14 (GCC 5.4.1)
Score 0
Code Size 818 Byte
Status
Exec Time 6 ms
Memory 892 KB

Test Cases

Set Name Score / Max Score Test Cases
Sample 0 / 0 0_00.txt, 0_01.txt, 0_02.txt, 0_03.txt
All 0 / 1300 0_00.txt, 0_01.txt, 0_02.txt, 0_03.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt, 1_12.txt, 1_13.txt, 1_14.txt, 1_15.txt, 1_16.txt, 1_17.txt, 1_18.txt, 1_19.txt, 1_20.txt, 1_21.txt, 1_22.txt, 1_23.txt, 1_24.txt, 1_25.txt, 1_26.txt, 1_27.txt, 1_28.txt, 1_29.txt, 1_30.txt, 1_31.txt, 1_32.txt, 1_33.txt, 1_34.txt, 1_35.txt, 1_36.txt, 1_37.txt, 1_38.txt, 1_39.txt, 1_40.txt, 1_41.txt, 1_42.txt, 1_43.txt, 1_44.txt, 1_45.txt, 1_46.txt, 1_47.txt, 1_48.txt, 1_49.txt, 1_50.txt, 1_51.txt, 1_52.txt, 1_53.txt, 1_54.txt, 1_55.txt
Case Name Status Exec Time Memory
0_00.txt 1 ms 256 KB
0_01.txt 1 ms 256 KB
0_02.txt 1 ms 256 KB
0_03.txt 1 ms 256 KB
1_00.txt 1 ms 256 KB
1_01.txt 1 ms 256 KB
1_02.txt 1 ms 256 KB
1_03.txt 1 ms 256 KB
1_04.txt 1 ms 256 KB
1_05.txt 1 ms 256 KB
1_06.txt 1 ms 256 KB
1_07.txt 1 ms 256 KB
1_08.txt 1 ms 256 KB
1_09.txt 1 ms 256 KB
1_10.txt 1 ms 256 KB
1_11.txt 1 ms 256 KB
1_12.txt 6 ms 892 KB
1_13.txt 6 ms 892 KB
1_14.txt 5 ms 892 KB
1_15.txt 5 ms 892 KB
1_16.txt 6 ms 892 KB
1_17.txt 6 ms 892 KB
1_18.txt 5 ms 892 KB
1_19.txt 5 ms 892 KB
1_20.txt 6 ms 892 KB
1_21.txt 6 ms 892 KB
1_22.txt 5 ms 892 KB
1_23.txt 5 ms 892 KB
1_24.txt 6 ms 892 KB
1_25.txt 6 ms 892 KB
1_26.txt 6 ms 892 KB
1_27.txt 6 ms 892 KB
1_28.txt 6 ms 892 KB
1_29.txt 6 ms 892 KB
1_30.txt 6 ms 892 KB
1_31.txt 5 ms 892 KB
1_32.txt 6 ms 892 KB
1_33.txt 6 ms 892 KB
1_34.txt 6 ms 892 KB
1_35.txt 6 ms 892 KB
1_36.txt 5 ms 892 KB
1_37.txt 6 ms 892 KB
1_38.txt 6 ms 892 KB
1_39.txt 6 ms 892 KB
1_40.txt 6 ms 892 KB
1_41.txt 6 ms 892 KB
1_42.txt 6 ms 892 KB
1_43.txt 6 ms 892 KB
1_44.txt 5 ms 892 KB
1_45.txt 5 ms 892 KB
1_46.txt 5 ms 892 KB
1_47.txt 5 ms 892 KB
1_48.txt 5 ms 892 KB
1_49.txt 5 ms 892 KB
1_50.txt 5 ms 892 KB
1_51.txt 5 ms 892 KB
1_52.txt 5 ms 892 KB
1_53.txt 5 ms 892 KB
1_54.txt 5 ms 892 KB
1_55.txt 5 ms 892 KB