OJ-Problems-Source/OpenJudge/ch0106_冰封/12.c

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2016-07-06 14:15:22 +08:00
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void resort(char *a, int size) {
int i;
for(i = 0; i < size / 2; i++) {
char c = a[i];
a[i] = a[size - 1 - i];
a[size - 1 - i] = c;
}
}
int max(int a, int b) {
return a > b ? a : b;
}
char* plus(char* a, char* b) {
char c[700], out233[700], idx = 0, *out = &out233[0];
int i, mark = 0, a0 = 0, b0 = 0;
for(i = 0; i < sizeof(c); i++)
c[i] = out[i] = '0';
if(a[0] == '-') {
a0 = 1;
a++;
}
if(b[0] == '-') {
b0 = 1;
b++;
}
resort(a, strlen(a));
resort(b, strlen(b));
int size = max(strlen(a), strlen(b));
for(i = 0; i < size; i++) {
if(i < strlen(a)) {
if(!(a0 == b0) && a0)
c[i] -= a[i] - '0';
else
c[i] += a[i] - '0';
}
if(i < strlen(b)) {
if(!(a0 == b0) && b0)
c[i] -= b[i] - '0';
else
c[i] += b[i] - '0';
}
c[i] += mark;
mark = 0;
if(c[i] > '9') {
c[i] -= 10;
mark = 1;
}
if(c[i] < '0') {
c[i] += 10;
mark = -1;
}
}
for(i = size; i > 0; i--)
if(c[i] != '0' || mark) {
if(mark) i--;
break;
}
if(mark < 0 || a0 && b0) {
out[idx] = '-';
idx++;
}
if(mark > 0) {
out[idx] = '1';
idx++;
}
for(; i >= 0; i--) {
if(mark < 0 && (a0 != b0))
c[i] = '9' - (c[i] - '0');
out[idx] = c[i];
idx++;
}
free(a);
free(b);
return out;
}
int main(int argc, char* argv[]) {
int cnt;
scanf("%i", &cnt);
char* res = (char*) malloc (700 * sizeof(char));
res[0] = '1';
while(cnt--) {
char* a = (char*) malloc (700 * sizeof(char));
strcpy(a, res);
res = plus(a, res);
}
puts(res);
return 0;
}