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46 lines
879 B
C
46 lines
879 B
C
3 years ago
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#include <stdio.h>
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#define N 1024
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int gcd(int a, int b);
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int main() {
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int n, d;
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int i, j, k;
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/* to use shorter types such as short is a BAD idea */
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static int A[N][N], B[N][N], C[N][N];
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int res = 0;
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scanf("%d %d", &n, &d);
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for (i = 0; i < n; ++i)
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for (j = i; j < n; ++j) {
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//printf("%d %d\n", i ,j);
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A[i][j] = gcd(i + 2,j + 2);
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A[j][i] = A[i][j];
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}
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//printf("nya!\n");
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for (i = 0; i < n; ++i)
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for (j = i; j < n; ++j) {
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//printf("%d %d\n", i ,j);
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B[i][j] = gcd(n - i,n - j);
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B[j][i] = B[i][j];
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}
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for (i = 0; i < n; ++i)
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for (j = 0; j < n; ++j)
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for (k = 0; k < n; ++k) {
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//printf("i:%d, j^%d, k^%d\n", i, j, k);
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C[i][j] += A[i][k] * B[j][k];
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}
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for (i = 0; i < n; ++i)
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for (j = 0; j < n; ++j)
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if (C[i][j] % d == 0)
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++res;
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printf("%d", res);
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}
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int gcd(int a, int b) {
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return (a == 0) ? b : gcd(b % a, a);
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}
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