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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <stdint.h>
  4. #include <inttypes.h>
  5.  
  6. #define gc getchar_unlocked
  7. #define pc putchar_unlocked
  8.  
  9. void scanu(uint* n) {
  10.    *n = 0;
  11.    int ch = gc();
  12.    while (ch < '0' || ch > '9') {
  13.       ch = gc();
  14.    }
  15.    while (ch >= '0' && ch <= '9') {
  16.       *n = (*n << 3) + (*n << 1) + (ch - '0');
  17.       ch = gc();
  18.    }
  19. }
  20.  
  21. //Big Endian
  22. typedef struct {
  23.    uint length;
  24.    uint64_t* digsets;
  25. } BigInt;
  26.  
  27. #define N 100
  28. #define D 1000
  29. #define BASE 100000000000000000
  30. BigInt* facts[N + 1];
  31. uint nf = 0;
  32.  
  33. BigInt* newBigInt(uint length, uint val) {
  34.    BigInt* res;
  35.    if ((res = malloc(sizeof(BigInt))) == NULL)
  36.       return NULL;
  37.    res->length = length;
  38.    if ((res->digsets = malloc(sizeof(uint64_t) * length)) == NULL)
  39.       return NULL;
  40.    res->digsets[0] = val;
  41.    uint i;
  42.    for (i = 1; i < res->length; ++i) {
  43.       res->digsets[i] = 0;
  44.    }
  45.    return res;
  46. }
  47.  
  48. void print(BigInt* f) {
  49.    char buffer[D];
  50.    uint i = f->length;
  51.    while (i > 0 && !f->digsets[--i]) {
  52.    }
  53.    uint b=sprintf(buffer,"%lu", f->digsets[i]);
  54.  
  55.    while (i--) {
  56.       //previously
  57.       //b+=sprintf( (buffer+b),"%017lu", f->digsets[i]);
  58.       b+=sprintf( (buffer+b),"%017" PRIu64, f->digsets[i]);
  59.    }
  60.    for (i = 0; i < b; ++i) {
  61.       pc(buffer[i]);
  62.    }
  63.    pc('\n');
  64. }
  65.  
  66. BigInt* multiply(BigInt* f, uint n) {
  67.    uint i;
  68.    BigInt* r = newBigInt(f->length + 1, 0);
  69.    for (i = 0; i < f->length; ++i) {
  70.  
  71.       r->digsets[i] += f->digsets[i] * n;
  72.       if (r->digsets[i] > BASE) {
  73.          r->digsets[i + 1] = r->digsets[i] / BASE;
  74.          r->digsets[i] -= r->digsets[i + 1] * BASE;
  75.       }
  76.    }
  77.    if (!r->digsets[r->length - 1]) {
  78.       r->length--;
  79.    }
  80.    return r;
  81. }
  82.  
  83. BigInt* factorial(uint n) {
  84.    uint i;
  85.    for (i = nf; i <= n; ++i) {
  86.       facts[i] = multiply(facts[i - 1], i);
  87.    }
  88.    return facts[n];
  89. }
  90.  
  91. int main(void) {
  92.    uint t;
  93.    scanu(&t);
  94.    facts[0] = newBigInt(1, 1);
  95.    facts[1] = facts[0];
  96.    nf = 2;
  97.    while (t--) {
  98.       uint n;
  99.       scanu(&n);
  100.       print(factorial(n));
  101.    }
  102.    return EXIT_SUCCESS;
  103. }
  104.  
  105.  
Success #stdin #stdout 0s 2692KB
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https://ideone.com/AzwXVf
language:
C (gcc 8.3)
created:
10 years ago
visibility:
secret

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