Calculate Minimum Satellites Required

Problem Overview

• Determine the minimum number of satellites needed to fully cover all target regions; return -1 if coverage is impossible.
• Input: intervals for target regions [start, end] and satellite coverage ranges [coverageStart, coverageEnd]; Output: a single integer.
• Domain: ISRO monitoring Earth latitude ranges using satellites.
• Constraints: full coverage required; overlaps allowed; each satellite only covers within its range.
• From Google interviews; a coding interview interview question problem on interval coverage.