41 lines
802 B
C++
41 lines
802 B
C++
#include <iostream>
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using namespace std;
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//#define DEBUG
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int main() {
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#ifndef DEBUG
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freopen("count.in", "r", stdin);
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freopen("count.out", "w", stdout);
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#else
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freopen("../count.in", "r", stdin);
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#endif
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long long x[31][31];
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long long m = 0;
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long long n = 0;
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long long s = 0;
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for (int i = 0; i <= 31; i++) {
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for (int j = 0; i <= 31; i++) {
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x[i][j] = 0;
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}
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}
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for (int i = 0; i <= 30; i++) {
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x[1][i] = 1;
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}
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cin >> m >> n;
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for (int i = 2; i <= m; i++) {
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for (int j = 0; j <= n; j++) {
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for (int k = 0; k <= j; k++) {
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x[i][j] += x[i-1][k];
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}
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}
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}
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for (int i = 0; i <= n; i++) {
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s += x[m][i];
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}
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cout << s;
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fclose(stdout);
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return 0;
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}
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