题解：【YACS 2021 年 5 月月赛 丙组】植树造林

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/*Code by Block_Fish*/
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#include <bits/stdc++.h>
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#define log printf
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#define EPS 1e-8
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#define INF 0x3f3f3f3f
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#define FOR(i, l, r) for (int(i) = (l); (i) <= (r); ++(i))
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#define IOS                      \
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 ios::sync_with_stdio(false); \
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 cin.tie(nullptr);            \
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 cout.tie(nullptr);
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using namespace std;
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typedef __int128 i128;
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typedef long long ll;
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typedef pair<int, int> PII;
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int a, b, c;
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template <typename T>
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inline T read() {
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 T sum = 0, fl = 1;
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 char ch = getchar();
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 for (; !isdigit(ch); ch = getchar())
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  if (ch == '-') fl = -1;
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 for (; isdigit(ch); ch = getchar()) sum = sum * 10 + ch - '0';
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 return sum * fl;
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}
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template <typename T>
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inline void write(T x) {
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 if (x < 0) {
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  putchar('-'), write<T>(-x);
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  return;
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 }
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 static T sta[35];
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 int top = 0;
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 do { sta[top++] = x % 10, x /= 10; } while (x);
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 while (top) putchar(sta[--top] + 48);
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}
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int main() {
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 a = read<int>(), b = read<int>(), c = read<int>();
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 write<int>(3 * max({a, b, c}) - (a + b + c));
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 return 0;
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}