Wrong Answer in Online Judge (CODECHEF)

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while(arr[i]!=l) and while(arr[i]!=r) are wrong. The indicators of the left and right sides, Li and Ri, are indices or counts, not the values in the array. You should use a simple for loop:

for (i = l; i <= r; ++i)
    pro = pro * arr[i-1] % m;

Note that the index is i-1 because Li and Ri are given using one-based indexing, but C uses zero-based indexing for its arrays.

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