34 lines
486 B
C++
34 lines
486 B
C++
#include <bits/stdc++.h>
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using namespace std;
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/*
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测试用例：
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4 5
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1 5
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5 2
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3 4
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2 3
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答案：3
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*/
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int n, m;
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const int N = 1e5 + 10;
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int w[N];
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int main() {
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cin >> n >> m;
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w[1] = 1; // 1号碗里放小球
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for (int i = 1; i <= n; i++) {
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int x, y;
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cin >> x >> y;
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swap(w[x], w[y]);
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}
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for (int i = 1; i <= m; i++)
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if (w[i]) {
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printf("%d\n", i);
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break;
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}
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return 0;
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} |