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23 lines
570 B
C++
23 lines
570 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 main()
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{
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int n, h, m;
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int v[1000];
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scanf("%d%d%d", &n, &h, &m);
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for (int i = 1; i <= n; i++) v[i] = h;
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for (int i = 0; i < m; i++)
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{
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int l, r, x;
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scanf("%d%d%d", &l, &r, &x);
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for (int j = l; j <= r; j++)
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v[j] = min(v[j], x);
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}
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long long ans = 0;
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for (int i = 1; i <= n; i++) ans += 1ll * v[i] * v[i];
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printf("%lld", ans);
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return 0;
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}
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