参考代码:
#include<bits/stdc++.h> using namespace std; typedef long long LL; const LL BASE = 1000000000000000000; const int SIZE = 1000024; LL A[SIZE >> 1], B[SIZE >> 1]; char cst[SIZE], cnd[SIZE]; int Conver(char ch[], LL N[]) { int Len = strlen(ch), Index = 0, Step = Len > 18 ? Len - 18 : 0; do { sscanf(ch + Step, "%18lld", &N[Index++]); Step -= 18; } while (Step >= 0); int C = Len % 18; if (C != 0 && Len > 18) { for (int pos = 0; pos < C; pos++) N[Index] = N[Index] * 10 + ch[pos] - 48; Index++; } return --Index; } int Multip(LL A[], int ALen, LL B[], int BLen) { for (int pst = 0; pst <= BLen; pst++) A[pst] += B[pst]; for (int pos = 0; pos <= max(ALen, BLen) + 3; pos++) { if (A[pos] >= BASE) A[pos + 1] += A[pos] / BASE; A[pos] %= BASE; } int last; for (last = ALen + BLen; last >= 0; last--) if (A[last]) break; return last < 0 ? 0 : last; } int main() { scanf("%s%s", &cst, &cnd); int ALen = Conver(cst, A); int BLen = Conver(cnd, B); int MLen = Multip(A, ALen, B, BLen); printf("%lld", A[MLen]); for (int pos = MLen - 1; pos >= 0; pos--) printf("%018lld", A[pos]); }
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