func_code_string: #include <bits/stdc++.h>   using namespace std;   long long int dp[101000];   int main(int argc, char const *argv[]) {     int t, a, b, k;     scanf( %d%d , &t, &k);     dp[0] = 1;     for (int i = 1; i <= 100000; i++) {       dp[i] = (dp[i] + dp[i - 1]) % 1000000007;       if (i >= k) dp[i] = (dp[i] + dp[i - k]) % 1000000007;     }     dp[0] = 0;     for (int i = 2; i <= 100000; i++) {       dp[i] = (dp[i] + dp[i - 1]) % 1000000007;     }     while (t--) {       scanf( %d%d , &a, &b);       long long int ans = (dp[b] - dp[a - 1] + 1000000007) % 1000000007;       cout << ans <<   n ;     }     return 0;   }   