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7853.c

c

#include <stdio.h>
#define MOD 1000000007
int main(void){
    register int test_case, idx;
    register long answer;
    int T;
    char c[1001];
    scanf("%d",&T);
    getchar();
    for(test_case = 1; test_case<=T; test_case++){
        idx = 0;
        answer = 1;
        c[idx++] = getchar();
        c[idx++] = getchar();
        c[idx++] = getchar();
        while('a'<=c[idx-1]){
            answer = c[idx-3]!=c[idx-2]&&c[idx-3]!=c[idx-1]&&c[idx-2]!=c[idx-1] ? (answer+(answer<<1))%MOD : c[idx-3]==c[idx-2]&&c[idx-2]==c[idx-1] ? answer : (answer<<1)%MOD;
            c[idx++] = getchar();
        }
        answer <<= c[0]!=c[1]&&c[idx-2]!=c[idx-3] ? 2 : c[0]==c[1]&&c[idx-2]==c[idx-3] ? 0 : 1;
        printf("#%d %d\n",test_case,answer%MOD);
    }
    return 0;
}
/* SAME CODE
#include <stdio.h>
#define MOD 1000000007
int main(void){
    register int test_case, idx, i;
    register long answer;
    int T;
    char c[1001];
    scanf("%d",&T);
    getchar();
    for(test_case = 1; test_case<=T; test_case++){
        idx = 0;
        answer = 1;
        do {
            c[idx++] = getchar();
        }while('a'<=c[idx-1]&&c[idx-1]<='z');
        answer <<= c[0]!=c[1]&&c[idx-2]!=c[idx-3] ? 2 : c[0]==c[1]&&c[idx-2]==c[idx-3] ? 0 : 1;
        for(i=1;i<idx-2;i++)
            answer = c[i-1]!=c[i]&&c[i-1]!=c[i+1]&&c[i]!=c[i+1] ?
            (answer+(answer<<1))%MOD : c[i-1]==c[i]&&c[i]==c[i+1] ?
                              answer : (answer<<1)%MOD;
        
        printf("#%d %d\n",test_case,answer%MOD);
    }
    return 0;
}
*/