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18 lines
449 B
C++
18 lines
449 B
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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int a[10050];
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int main()
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{
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int l, m;
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cin >> l >> m;
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a[0] = 1;
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for (int i = 0, x, y; i < m; i++)
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cin >> x >> y, a[x]--, a[y + 1]++;
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for (int i = 1; i <= l; i++)
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a[i] += a[i - 1];
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cout << count_if(a, a + l + 1, [](const auto x) { return x > 0; });
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return 0;
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}
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