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29 lines
937 B
C++
29 lines
937 B
C++
#include <cstdio>
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inline int min(int a, int b) { return a < b ? a : b; }
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inline int max(int a, int b) { return a > b ? a : b; }
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const int N = 50010;
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const int LogN = 16;
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int minT[LogN][N], maxT[LogN][N], Log[N];
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int main()
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{
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Log[0] = -1;
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for (int i = 1; i < N; i++) Log[i] = Log[i >> 1] + 1;
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int m, n;
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scanf("%d%d", &n, &m);
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for (int i = 1, x; i <= n; i++)
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{
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scanf("%d", &x);
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minT[0][i] = maxT[0][i] = x;
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}
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for (int j = 1; j < LogN; j++)
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for (int i = 1; i + (1 << j) - 1 <= n; i++)
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minT[j][i] = min(minT[j - 1][i], minT[j - 1][i + (1 << (j - 1))]),
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maxT[j][i] = max(maxT[j - 1][i], maxT[j - 1][i + (1 << (j - 1))]);
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for (int i = 1, x, y, z; i <= m; i++)
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{
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scanf("%d%d", &x, &y);
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z = Log[y - x + 1];
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printf("%d\n", max(maxT[z][x], maxT[z][y - (1 << z) + 1]) - min(minT[z][x], minT[z][y - (1 << z) + 1]));
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}
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return 0;
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} |