虽然我不懂...
1 #include <cstdio> 2 #include <cstring> 3 #include <map> 4 #include <cmath> 5 using namespace std; 6 #define LL __int64 7 LL p[1001],o[1001]; 8 LL x,y; 9 LL ext_eulid(LL a,LL b) 10 { 11 LL t,d; 12 if(b == 0) 13 { 14 x = 1; 15 y = 0; 16 return a; 17 } 18 d = ext_eulid(b,a%b); 19 t = x; 20 x = y; 21 y = t - (a/b)*y; 22 return d; 23 } 24 LL gcd(LL a,LL b) 25 { 26 return b == 0?a:gcd(b,a%b); 27 } 28 int main() 29 { 30 int i,n,z; 31 LL p1,o1,d,c,mod; 32 while(scanf("%d",&n)!=EOF) 33 { 34 for(i = 0;i < n;i ++) 35 { 36 scanf("%I64d%I64d",&p[i],&o[i]); 37 } 38 p1 = p[0]; 39 o1 = o[0]; 40 z = 1; 41 for(i = 1;i < n&&z;i ++) 42 { 43 d = ext_eulid(p1,p[i]); 44 c = o[i] - o1; 45 if(c%d) z = 0; 46 mod = p[i]/d; 47 x = ((c/d*x)%mod+mod)%mod; 48 o1 = p1*x + o1; 49 p1 = p1*mod; 50 } 51 if(!z) 52 printf("-1 "); 53 else 54 printf("%I64d ",o1); 55 } 56 return 0; 57 }