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import std.stdio:writeln;
int[][] conflict_intervals(ref int[][] arr)
{
int[][] ret;
for(ulong i = 1; i < arr.length; ++i)
{
bool b = false;
for(ulong j = 0; j < i; ++j)
if(arr[i][0] >= arr[j][0] && arr[i][0] <= arr[j][1]) b = true;
if(b) ret ~= arr[i];
}
return ret;
}
void main()
{
int[][] arr = [[1,4],[3,5],[6,8],[12,13],[3,20]];
int[][] arr2 = [[3,4],[5,7],[6,9],[10,12],[13,15]];
writeln(conflict_intervals(arr));
writeln(conflict_intervals(arr2));
}
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