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193.cpp
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58 lines (52 loc) · 818 Bytes
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//ac
#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
char s[2010];
int len;
void sub(int n) {
for (int i = len - 1; i >= 0; --i) {
s[i] -= n;
if (s[i] < '0') {
s[i] += 10;
n = 1;
} else {
break;
}
}
}
void div() {
int add = 0;
for (int i = 0; i < len; ++i) {
int m = s[i] - '0' + add * 10;
if (m % 2) add = 1;
else add = 0;
s[i] = m / 2 + '0';
}
}
int main() {
scanf("%s", s);
len = strlen(s);
int num = s[len - 1] - '0';
if (num % 2) {
sub(1);
div();
} else {
if (len > 1) num += 10 * (s[len - 2] - '0');
num /= 2;
div();
//cout << s << endl;
//cout << num << endl;
if (num % 2) {
sub(2);
} else {
sub(1);
}
}
int d = 0;
while (s[d] == '0') ++d;
for (d; d < len; ++d) printf("%c", s[d]);
printf("\n");
return 0;
}