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15 lines
538 B
C++
15 lines
538 B
C++
#include <cstdio>
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inline int abs(int x) { return x >= 0 ? x : -x; }
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int t[100010], x[100010], y[100010], f[100010], n, m, ans;
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int main()
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{
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scanf("%d%d", &n, &m);
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for (int i = 0; i < m; i++) f[i] = 1, scanf("%d%d%d", t + i, x + i, y + i);
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for (int i = 0; i < m; i++)
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for (int j = 0; j < i; j++)
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if (abs(x[i] - x[j]) + abs(y[i] - y[j]) <= abs(t[i] - t[j]) && f[i] < f[j] + 1)
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f[i] = f[j] + 1;
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for (int i = 0; i < m; i++) if (f[i] > ans) ans = f[i];
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printf("%d", ans);
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return 0;
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} |