func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long t, k, i;     scanf( %lld %lld , &t, &k);     long long dp[100001];     dp[0] = 1;     for (i = 1; i < 100001; i++) {       dp[i] = dp[i - 1];       if (i >= k) dp[i] += dp[i - k];       dp[i] = dp[i] % 1000000007;     }     long long sum[100001];     sum[0] = dp[0];     for (i = 1; i < 100001; i++) sum[i] = (dp[i] + sum[i - 1]) % 1000000007;     while (t--) {       long long a, b;       scanf( %lld %lld , &a, &b);       printf( %lld n , (sum[b] - sum[a - 1] + 1000000007) % 1000000007);     }   }   