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#include <stdlib.h>
#include <ctype.h>
int atoi(const char *s)
{
int n=0, neg=0;
while (isspace(*s)) s++;
switch (*s) {
case '-': neg=1;
case '+': s++;
}
while (isdigit(*s))
n = 10*n + *s++ - '0';
return neg ? -n : n;
}
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