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Runtime: 191 ms (Top 53.06%) | Memory: 77.6 MB (Top 21.02%)
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// Runtime: 191 ms (Top 53.06%) | Memory: 77.6 MB (Top 21.02%)
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var kInversePairs = function(n, k) {
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const dp = new Array(n+1).fill(0).map(el => new Array(k+1).fill(0))
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const MOD = Math.pow(10, 9) + 7
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for(let i = 0; i < n+1; i++) {
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dp[i][0] = 1
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}
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for(let i = 1; i <= n; i++) {
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for(let j = 1; j <= k; j++) {
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dp[i][j] = (dp[i][j-1] + dp[i-1][j] % MOD) - (j >= i ? dp[i-1][j-i] : 0)%MOD
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}
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}
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return dp[n][k] % MOD
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};
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};

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