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private static int romanToInt(String s) { int result = 0, size = s.length(); for (int i = 0; i < size; i++) { switch (s.charAt(i)) { case `I`: if (i < size - 1) { if (s.charAt(i + 1) == `V`) { result += 4; i++; } else if (s.charAt(i + 1) == `X`) { result += 9; i++; } else { result += 1; } } else { result += 1; } break; case `V`: result += 5; break; case `X`: if (i < size - 1) { if (s.charAt(i + 1) == `L`) { result += 40; i++; } else if (s.charAt(i + 1) == `C`) { result += 90; i++; } else { result += 10; } } else { result += 10; } break; case `L`: result += 50; break; case `C`: if (i < size - 1) { if (s.charAt(i + 1) == `D`) { result += 400; i++; } else if (s.charAt(i + 1) == `M`) { result += 900; i++; } else { result += 100; } } else { result += 100; } break; case `D`: result += 500; break; case `M`: result += 1000; break; } } return result; } ©

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