Create 1977-number-of-ways-to-separate-numbers.js

Author: everthis

1977-number-of-ways-to-separate-numbers.js

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+function  numberOfCombinations( num) {
+  let dp = Array(3501).fill(0), dpp=Array(3501).fill(0), pf=Array(3501).fill(0), n = num.length, mod = 1000000007;
+  for (let l = 1; l <= n; ++l) {
+       dpp[0] = 1;
+      for (let i = n; i - l > 0; --i)
+          pf[i - 1] = num[i - 1 - l] == num[i - 1] ? pf[i] + 1 : 0;
+      for (let i = 0; i < n; ++i) {
+          dp[i + 1] = dpp[i + 1];
+          if (l <= i + 1 && num[i + 1 - l] != '0') {
+              if (i + 1 - 2 * l >= 0 && (pf[i + 1 - l] >= l || num[i + 1 - l + pf[i + 1 - l]] > num[i + 1 - 2 * l + pf[i + 1 - l]]))                    
+                  dp[i + 1] = (dp[i + 1] + dp[i + 1 - l]) % mod;
+              else
+                  dp[i + 1] = (dp[i + 1] + dpp[i + 1 - l]) % mod;
+          }
+      }
+      let tmp = dpp
+      dpp = dp
+      dp = tmp
+  }    
+  return dpp[n];
+}