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70 . **/
71
72 #include
73 #include
74 #include
75 #include
76 #include <string.h>
77 #include
78 #include
79 #include
80 using namespace std;
81
82 #define FFI(a, b) for(int i = a; i 83 #define FFJ(a, b) for(int j = a; j 84 #define FFK(a, b) for(int k = a; k 85 #define RR(a, b) for(int i = a; i > b; i++)
86 #define ME(a, b) memset(a, b, sizeof(a))
87 #define SC(x) scanf("%d", &x)
88 #define SCC(a, b) scanf("%d%d", &a, &b)
89 #define PR(x) printf("%d\n", x)
90 #define PRR(a, b) printf("%d%d\n", a, b);
91 #define INF 0x3f3f3f3f
92 #define MAX 202
93 #define MOD 1000000007
94 #define E 2.71828182845
95 #define M 8
96 #define N 6
97 typedef long long LL;
98 const double PI = acos(-1.0);
99 typedef pair<int, int> Author;
100 vectorstring, int> > VP;
101
102 /*******************************************************************************************************************************************************/
103
104 int main(void){
105 // #ifdef Empirefree
106 // freopen("in.txt", "r", stdin);
107 // freopen("out.txt", "w", stdout);
108 // #endif
109 //
110 // ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
111 int n;LL a, b, s;
112
113 SC(n);
114 //弃九法
115 while(n--){
116
117 scanf("%lld%lld", &a, &b);
118 if(!a || !b){
119 printf("0\n");
120 continue;
121 }
122 s = (a % 9) * (b % 9) % 9;
123
124 printf("%lld\n", s == 0 ? 9 : s);
125 }
126
127 return EXIT_SUCCESS;
128 }
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